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 30, 2009
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Plain & simple: another name for the penis.
{Seen on a BBS about wheelchairs and scooters -- in its, "Daily Check-In" thread}

As I did yesterday & the day before, I'll kindly dispense with the “{vulgar slang term for male piss weasel (six letters, starts with 'P' and ends with “R", rhymes with “wrecker" {P3K3R})} stuck in the {slang term for wall-mounted porcelain urinal (ten letters, starts with “W" and ends with “T", doesn't rhyme with anything {walltoliet})}" text today.
by Telephony January 28, 2016
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