2
weasel piss to mean the bottom of a drink by which people say is mostly spit.
ex. 1

Dude: "Yo man, you wanna finish this?"

Man: "Nah dude, I don't want your weasel piss."

ex. 2

Dude: "Hey, there's a little left in here."

Bro: "That's all weasel piss."
by Sittin' Easy March 29, 2009
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