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
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An alternate name for windshield washing fluid.
Dad: hand me that jug of monkey piss will ya?

son: okay!
by Craziac January 14, 2008
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adjective: Angry

When a person is pushed past the point of extreme anger - because nothing in the world is working as it should - to the point where all the person can do is hop around, yell, urinate on the floor, and throw feces.
Vernon: Hey man, what's up?

Matt: Work is sucking the soul out of me, my computer just got the blue screen of death, the stock market crashed again, and I just bit my tongue. My blueberry yogurt in the fridge is the only good thing in my life.

Vernon: Natalie just ate it.

Matt: I'm so monkey-pissed right now.
by Mattydreads1 May 06, 2010
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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
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piss monkey a name given to mice and rats for their constant peeing pooping and destructiveness
I smell a piss monkey and see his calling card I know hes here tearing up stuff

mouse ,rat ,squirrel ,groundhog ,chipmunk
by littlejimmie October 25, 2015
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An accumulation of dried urine and pubic hairs, most often found growing in and around men's urinals.
"Hey woman, get out of here with them fucking scrubby bubbles. We're building us a piss monkey!"
by NakedReporta February 13, 2008
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