A adjective or noun that refers to a persons penis or metaphorical penis, typically used by older creepy ass men. The weasel in ones pants being the dick.
"stop that you weasel pants."

"Mr Ferri you're a fucking creep."

"language young weasel pants."
by voluptuous frog March 13, 2019
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When you can see the outline of a mans manhood through his pants and it looks like a weasel in his pants. Often implying said manhood is larger than average
Whoa, check out John's pant weasel, I think he needs bigger pants.
by JaketheSnake79 April 19, 2016
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