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Its like saying," aint you" but instead you say aincha. Mostly used as a question
Hey Kimmy, aincha gonna get the fuck out of my way?

I aincha bitch.
by Kelsi January 16, 2005
The skin between your balls/cunt and your arse/ass. No man's land
It aincha balls and it aincha ass
by Terry Boy September 20, 2003