T.U.B.

Thumb up the butt. When having sex doggie style the man inserts his thumb while the other 4 fingers are up ward on her butt facing the swell of her back

"Dude i T.U.B.ed that girl last night. She was totally into it!"

by antivenom510 September 20, 2009

T.U.B

Toss up bitch, as in a girl that you will do anything you want sexually

"yeah she ate my asshole, she's a T.U.B"

by the paul May 13, 2005