This is the area in which your ballsack and penis live my dear Watson.
Jerry's ballsack was swollen and changing colors from being hit in his crotchular region with a baseball bat.
A slang contraction for What's that.
Bob: Jeff, you smell like a sackfull of dirty buttholes. Go take a shower.
Jeff: Whasat?! I can't hear you over my iPod!
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The act of yelling BALLSACK! at a passerby out of your car window
Yesterday my friend and I went ballcalling! We ballcalled this old guy and he had no clue what hit him!