Top Definition
A codename for "send nudes".
"Hey girl, rat piss"
via giphy
by Lil Skoot March 06, 2017

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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)
by dylan. September 18, 2007

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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A codename for "send nudes".
"Hey girl, rat piss"
by Lil Skoot March 06, 2017

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug