A combination of twat and ass.
I totally just cupped that girl's twass with my entire hand!
by SuperStripper January 28, 2011
That area of skin which lies between the "twat" (vulva) and "ass" (anus) on a female's gentalia; Also known as the "taint" or "choad" for females; "tweener" for both males and females; and "painus" for males.
If you wanna' make sure she's enjoying your oral escapades below her belt reach beyond variety and repetition and frequent the perimeters--especially her clit and twass.
by Delphine O'Reilly June 13, 2008