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Any alchohol originating from Mexico.
Are you gay? I'd rather drink Old Style then drink that monkey piss.
by ACZxxx December 28, 2010
The last sip at the bottom of a beer can or bottle. People usually dump it out instead of drinking it because it usually consists of backwash and warm beer.
Guy 1: Dude, why are you wasting that beer?
Guy 2: I'm not man. This is just the monkey piss.
Guy 1: Oh, my bad.
by Dave May 03, 2005
The bottom inch of a 40 oz. bottle of beer.
Who wants the monkey piss?!?!?!?!?!
by Rusty Shackleford January 18, 2005
An alternate name for windshield washing fluid.
Dad: hand me that jug of monkey piss will ya?

son: okay!
by Craziac January 14, 2008