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1. The act of accidentally shitting your pants.
Did you see Johnny? From the smell of him he must have J-Wagged in his pants.

Dude, Mark totally J-Wagged in his pants today.
by DustMasterrrrrrr January 29, 2011
One who stocks Mothers that have just had their baby within weeks prior.
She just had a kid last week. I'm going to J-Wagg her.
by Hefe Larsone September 27, 2007