The act of having your partner finish you off on her face and or chest, in the motion of the shake-weight from them hilarious commercials.
Kevin: " hey, did you go home with that bartender last night?''
Steve: " well, we went back to my house, had a few drinks, smoked a joint and then she ended up shake-weighting me."
Kevin: " you lucky bastard. I can't beleive she shake-weighted you."