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1.
1. An inappropriately large jump in weight between attempts in a powerlifting competition.

2. Any situation, sports or otherwise, where a person attempts to accomplish something far beyond their previous best effort.
Boy: Daddy, that big hairy man in a swimsuit just PR'd at 533.5. And he called for 570 for his final lift! That's a crazy jump.

Dad: No, son, that's an AC Jump.
by Le Pizz April 07, 2010