To jerk off profusively pounding on your sack.
I caught Gil whacking his bag today.
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the art of walking past one of your boys and giving him the little "love tap" back hand to his privates for sport.
Corey didn't expect the whack bag I layed on him in the line at Subway.
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A hard strike to ones genitals, Usually done with closed fist, or foot.
" All I did was poke her sisters tit and she freakin Whack Bagged me in the giggle berries!"
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