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A term made popular by the Jerky Boys in the 90's. It's a put down that describes either a fat guy with large he-tits or a body-builder with huge pectorals.
You think you're a tough guy, huh beefy tits, fruity-ass...
by S AL November 23, 2005
When a female breast consists of more muscle than fat. Pretty nasty if you ask me...
"WTF?! That powerdyke has beefy tits! She must be one of them nasty body builders!"
by Winged Poop November 11, 2004