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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.
1-

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

2-
"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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