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Mom Joke Gone Bad. Mostly used in terms of when someone says a 'your mom' joke, just to learn the persons mom is either dieing,dead or ill.
BOY1:"Are you like stupid or something?"
BOY2:"Your MOM!"
*BOY1 runs off*
BOY3:"Dude, Not cool."
BOY3:"That was such a MJGB."
BOY2:"A what?"
BOY3:"Mom joke gone bad, you see his mom died in a car accident last year...He never really got over it."
*Akward silence.*
by -DisasterLindsey- May 25, 2009
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