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1.
1. When a person, who is deceptively strong for the amount of muscle that they have, can lift the same amount of weight or more than someone who is a lot larger.

2. When a skinny kid comes out of nowhere and is insanely strong... and no one knows...
Jim: "I was at the gym today maxing out at 280 lbs..."
Andrew: "That's awesome!"
Jim: "But then this guy who looks like he weighed half as much as me did that weight as his warm up. He freakin muscle juked me."
by dontgetspiked April 01, 2010