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!"
Totally Unnecessary Bitch Session - The act of being bitched at by a friend or significant other for seemingly no reason at all, often accompanied by false claims, random insults, and long rants.
Something wrong Sarah? Jennifer totally justtext T.U.B.S.ed me for not returning her phone call the other day.