A large male. stocky, bulky, roundish, someone resembling a meatball, but under that polo, is it fat..or is it intense muscle mass? Is this meatball man fat.. or jacked?
Girl 1: Yo, Josh is really cute! Don't you think?
Girl 2: Yea he's got a great smile.. but is he fat or jacked?
by Ishnala December 12, 2010
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Sexual attacks or advances by a large person.
"Yo, Kalen got fat-jacked at lunch."

"Yeah that fat girl was all up on him."
by HaxNick February 9, 2009
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Fat Jack is not your typical jack. Some may call him a simple man, other would define him as a drown to the party. Fat jack doesn't only cock block but also cocks blocks. like I said a simple man.
Stop being such a fat jack and having sex with my Childs play blocks
by Swaggy squirrel November 18, 2020
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