Contraction of "ain't" and "ya"; means "aren't you."
by Anonymous May 3, 2003
Well if it aintcha balls and it aintcha asshole, it's ya aintcha. It's the area between the two. (also can be known as your gooch or taint.)
when i was having sex with my girlfriend last night, i hurt my penis because i pulled out too far and hit her aintcha on my way back in
by coltan072609 September 13, 2009
by old dirty February 16, 2003
Fingal counted eleven tick bites - that he could see. A few more could be felt: one on his left arse cheek, for example, one on his scalp, and two in the perineum, or the gouch, the area of skin between a human's anus and scrotum (some Australians, he'd learned, also referred to the gouch as the as the aintcha, as in "well it aintcha balls, or your arse") Binjari ticks loved the gouch.
by Delbosco October 15, 2021