what is the Manly Art of Fart Burning?

Question

I was reading Frank Zappa's book. then came up with this and don't know what it means,I'll cite the whole paragraph:
"The family was from Arkansas. The Dad (Dink) was a furniture salesman in San Bernardino,
but, back in the way-back-when, he used to play 'bones' or 'spoons' in a minstrel show. To relive the
golden days of yesteryear he would, from time to time, force his children to accompany him (Ronnie
on guitar, Kenny on trombone) in a living room replay of a minstrel routine called "Lazy Bones."
The kids often found this to be an inconvenience, as they were fascinated by, and constantly
perfecting new techniques for, The Manly Art Of Fart-Burning."

Answer 1

You can ignite your own farts, because they consist largely of methane. The ignited gas produces a momentary blue flash. This "manly art of fart burning" is best done with clothes on, to avoid getting singed (apparently).