1 definition by myballshurtalot

Weed Wacker: when a male's erected penis continuously slaps a woman on her knees across the face during sex.

The male with his erected penis will rotate his hips to the left and right at a constant motion slapping the woman across the face.
Man: Oh baby, ready for the weed wacker?!
The Girlfriend: Yay! I've been waiting a long time for this!

Bill: Ow... My penis hurts from the weed wacker...
Jim: What did you do?
Bill: Don't worry about it.
by myballshurtalot March 10, 2010
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