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1.
When a girl gives you a really hard, fast-paced handjob, as if your dick was a shakeweight.

Could result in severe discomfort, chaffing, and difficulty shaking your dick after pissing.
Dude my dick hurts so bad after my girlfriend gave me a hj yesterday. I can't even feel my dick.

Sounds like you got shakeweighted.
by Kfed27 January 20, 2011
 
2.
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: "yeah."

Kevin: ''DETAILS!"

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."
by prodigyofmind July 26, 2010