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A term that refers to any male that has either passed puberty, or in the middle of it, and is under the height of 5 feet.
Most flemsacks are homosexual, like anime, and are really clingy.

"Yo homie, you seen that lil nigga over that way?"
"Sittin' next to that thick bitch?"
"He looks like he's pissing her off."
"Hmm... must be a flemsack"

"is that lil nigga a midget?"
"nah homie. It's just an average flemsack."
by That one porno ad November 22, 2016
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