where does the sexual slang word "C U M" come from?

Answer 1

(v. and n.) seems to be a modern (by 1973) variant of the sexual sense of come that originated in pornographic writing, perhaps first in the noun sense. This "experience sexual orgasm" slang meaning of come (perhaps originally come off) is attested from 1650, in "Walking In A Meadowe Greene," in a folio of "loose songs" collected by Bishop Percy.

They lay soe close together, they made me much to wonder;
I knew not which was wether, until I saw her under.
Then off he came, and blusht for shame soe soon that he had endit;
Yet still she lies, and to him cryes, "one more and none can mend it."

As a noun meaning "semen or other product of orgasm" it is on record from the 1920s. The sexual *** seems to have no connection with L. ***, the preposition meaning "with, together with," which is occasionally used in English in local names of combined parishes or benifices (e.g. Chorlton-***-Hardy), in popular Latin phrases (e.g. *** laude), or as a combining word to indicate a dual nature or function (e.g. slumber party-***-bloodbath).
http://www.etymonline.com/index.php?l=c&p=32

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Answer 2

Pro baby from the Hindi word Karmah (not peace) also used in the word cummerbund meaning a loin cloth or wrap around .. may have been brought back as soldiers slang in the 17-18th century (East India Trading company) who took the word to be 'from the loins' .. the word for 'wrap' and 'from' being similar in Hindi

Kurmah = from, karmah = wrap

a Kurmahbund would be from the loins

(pronounced kummerboond)

a karmahbund is wrap the loins

pronounced kummaboond