Doctors Orders No. 9?

Question

You know how they say "legs eleven" and "two fat ladys 88" and so on in bingo and number games and stuff, why do they say "No. 9 Doctors orders"?

Answer 1

I found this answer on Yahoo! Answers:

The list below shows the nickname of each bingo number with variants. Remember that no list is definitive and some nicknames may not make sense. If you are planning to make up a list of nicknames for use in a bingo hall or at home, choose the ones that most appeal to you..
Bingo play using nicknames persisted in British Bingo halls until faster computer draws replaced air-blown balls. This is a way of announcing or repeating the Bingo number drawn in a humorous way. In a crowded, noisy room, it also helps to confirm the number called.
The bingo game starts with the traditional call to attention: "Eyes Down".
(?) = See explanation below
1.... Kelly's eye, Buttered scone, At the beginning, Little Jimmy, Nelson's column, B1 Baby of bingo
2.... One little duck, Baby's done it, Doctor who, Me and you, Little boy blue
3.... Dearie me, I'm free, Debbie McGee, You and me, Goodness me, One little flea, Cup of tea
4.... The one next door, On the floor, Knock at the door, B4 Crowd says "and after", Bobby Moore
5.... Man alive, Jack's alive, One little snake
6.... Tom Mix, Tom's tricks, Chopsticks
7.... Lucky seven, God's in heaven, One little crutch
8.... Garden gate, Golden gate, At the gate, Harry Tate, One fat lady, She's always late, Sexy Kate, Is she in yet
9.... Doctor's orders (?)
10.. Downing street (?), **** and hen (rhyming), Uncle Ben (rhyming), Tony's Den
11.. Legs eleven, Legs - they're lovely, Kelly's legs number eleven, Chicken legs
12.. One dozen, One and two - a dozen, Monkey's cousin (rhymes with "a dozen"), One doz' if one can
13.. Unlucky for some, Devil's number, Bakers dozen
14.. Valentines day
15.. Rugby team, Young and keen
16.. Sweet sixteen, She’s lovely, Never been kissed
17.. Often been kissed, Old Ireland, Dancing queen, The age to catch ‘em, Posh and Becks
18.. Key of the door, Now you can vote, Coming of age
19.. Goodbye teens
20.. One score, Getting plenty, Blind 20
21.. Royal salute, Key of the door
22.. Two little ducks (suggesting the necks of two swans), Ducks on a pond, Dinky doo, All the twos, Bishop Desmond, Put your 22's on
23.. A duck and a Flea, Thee and me, The Lord's my Shepherd (based on 23rd Psalm)
24.. Two dozen, Did you score?, Do you want some more?
25.. Duck and dive
26.. Bed and breakfast (traditional price was 2 shillings 6 pence), Half a crown (equivalent to 2 shillings 6 pence), Pick and mix
27.. Little duck with a crutch, Gateway to heaven
28.. In a state, The old brags, Over weight, Duck & its mate
29.. You’re doing fine, In your prime, Rise and shine
30.. Burlington Bertie, Dirty Gertie, Speed limit (in built-up area, UK), Blind 30, Flirty thirty
31.. Get up and run
32.. Buckle my Shoe
33.. Dirty knees, All the feathers, All the threes, Gertie Lee, Two little fleas, Sherwood forest (all the trees)
34.. Ask for more
35.. Jump and jive
36.. Three dozen
37.. A flea in heaven, More than eleven
38.. Christmas cake
39.. Those famous steps, All the steps
40.. Two score, Life begins at, Blind 40, Naughty 40
41.. Life’s begun, Time for fun
42.. That famous street in Manhattan, Whinny the Poo
43.. Down on your knees
44.. Droopy drawers, All the fours, Open two doors
45.. Halfway house, Halfway there, Cowboy's friend
46.. Up to tricks
47.. Four and seven
48.. Four dozen
49.. PC (Police Constable), Copper, Nick nick, Rise and shine
50.. Bulls eye, Bung hole, Blind 50, Half a century, Snow White's number (five-oh, five-oh..), Hawaii five O
51.. I love my mum, Tweak of the thumb, The Highland Div[ision]
52.. Weeks in a year, The Lowland Div[ision], Danny La Rue
53.. Stuck in the tree, The Welsh Div[ision]
54.. Clean the floor, House of bamboo (famous song)
55.. Snakes alive, All the fives, Double nickels, Give us fives, Bunch of fives
56.. Was she worth it?
57.. Heinz varieties, All the beans (Heinz 57 varieties of canned beans)
58.. Make them wait, Choo choo Thomas
59.. Brighton line (engine 59)
60.. Three score, Blind 60, Five dozen
61.. Bakers bun
62.. Tickety boo, Turn on the screw
63.. Tickle me
64.. The Beatles number, Red raw
65.. Old age pension, Stop work (retirement age)
66.. Clickety click, All the sixes
67.. Made in heaven, Argumentative number
68.. Saving grace
69.. The same both ways, your place or mine?, Any way up, Either way up, Any way round, Meal for two, The French connection
70.. Three score and ten, Blind 70
71.. Bang on the drum
72.. A crutch and a duck, Six dozen, Par for the course (golf)
73.. Crutch with a flea, Queen B, Under the tree
74.. Candy store
75.. Strive and strive, Big Daddy
76.. Trombones, Seven 'n' six - was she worth it?
77.. Sunset strip, All the sevens, Two little crutches
78.. Heavens gate
79.. One more time
80.. Gandhi's breakfast, Blind 80, Eight and blank, There you go matey
81.. Fat lady and a little wee, Stop and run
82.. Fat lady with a duck, Straight on through
83.. Fat lady with a flea, Time for tea, Ethel's Ear
84.. Seven dozen
85.. Staying alive
86.. Between the sticks
87.. Fat lady with a crutch, Torquay in Devon
88.. Two fat ladies, Wobbly wobbly, All the eights
89.. Nearly there, All but one
90.. Top of the shop, Top of the house, Blind 90, As far as we go, End of the line

Explanations of some nicknames:
9 Doctor's orders
Apparently in the second world war in Britain doctors wrote on sick notes a 9 p.m curfew , thus if patients were found out of their homes after that time they were violating their sick note.
10 Downing street
UK Prime Minister's address, 10 Downing Street.
76 Seven 'n' six - was she worth it?
The price of the marrige licence, seven shillings and six pence.

Answer 2

have you heard of love portion no.9.

Answer 3

doing fine, in the vagin !