Like a fart, but backwards. Instead of expelling gas out of the anus, you would suck air into the ass. (verb)
I was at church the other day and I cut a raging, mega-huge egg fart during communion. But luckily I was able to tarf afterwards to save everyone on my "pew" from smelling it.
"Yeh, I delggig elihw ehs saw no ym pal dna I yltnedicca tel tuo a yrebbulf tarf. Spoow, I naemtraf lol! Gnissarrabme ni htob sdrager )*: ." -Dyslexic person