STP
Standard Temperature and Pressure
It is used to describe a substance at....
Pressure: 1 atm; 760 mmHg; 101,300 pascals
Temperature: 0°C, 32 F, 273.15 K (kelvin)

It is often used to describe gasses.
The water was starting to freeze at STP.
At STP one mole of gas will occupy 22.4 liters.
by Transpolar Drift Stream July 19, 2011

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Top Definition
STP
Shavin The Pubes!!
Jo- Cho- "yea foo so whats up? what are you doing?"

Bryant-Rachi- " ahhh foo stp, i got a date tonight.!!"
by Jo-Cho August 16, 2009

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Secret Tweaker Pad, from the Sublime song, S.T.P. It's a place where one can chill and do drugs and hide out after committing a crime.
Get out of my S.T.P!
by con4mconsumeobey January 18, 2005

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Stone Temple Pilots. Originally stood for Shirley Temple's pussy. But the band had to change the meaning when they became main stream.
The Band S.T.P. could still be a great band making great music if Scott Weiland could stay off the Horse.
by brutha from a nutha mutha May 20, 2006

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Standard Temperature and Pressure, a Chemistry term referring to gasses under normal or ideal conditions.
S.T.P for oxygen gas is 25 degrees c and 1 atm of pressure
by Steve December 04, 2003

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Stone Temple Pilots, a great band
by Anonymous September 29, 2003

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STP
Stand To Pee.
You know... guys do it.

This usually applies to transgender men (FtM female to male).
I can't seem to get the hang of STP'ing...
by wwelpo April 29, 2011

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