When you and your buddy are smashing the same girl, your buddy slips out accidently so you reach over and
lift up his dick to help him continue.
Thanks Dad for the Lift-Up!!!
Lift-Up: define #2
A sex position when you left a girl up and destroy her.
Im about to lift up instantly
Lift-Up: define #3
A sexual term meaning to help your partner or partner’s penis back into the girl.
Me and my buddy were bagging this girl together. He slipped out so I gave him a lift up since he was under her.