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The lst half inch of the beer. Usually gets warm and unpleasent.
danny-you gonna finish that?
daniel-nah it's only the ratpiss *poors out the last half inch of beer*

(also used by people who can't drink)
ratpiss by dylan. October 2, 2007
Ratpiss is ratpissed
Ratpiss by David jacobvirxh September 18, 2023

Rat piss 

"Hey girl, rat piss"
Rat piss by Lil Skoot March 6, 2017

Rat piss 

"Hey girl, rat piss"
Rat piss by Lil Skoot March 6, 2017

Rat piss 

The last dregs of an assortment of (usually hard) liquors, all combined in one bottle to make enough booze to get properly drunk. it’s like cold duck but for hard liquors. Taste can range from okay to horrendous. An invention borne out of convenience so you don’t have to haul twenty almost-empty bottles to a DIY show. Also useful if you’re nicking booze from somebody and you don’t want them to notice, so you just take a tiny bit from each bottle.
Man, pass the rat piss, I drank through all the beer i brought.
Rat piss by yllowyllow August 29, 2018
The ship between Katniss and Rue😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍
LOOK! ITS A WILD RATNISS
Ratniss by Cheetopufferz July 10, 2022