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
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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
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