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2.
STP for Absolute Zero on the Kelvin scale, (also known as 0 degrees celsius).

Used to describe something freezing, which is a hyperbolic synonym to the adjective "cool".
"Ayyo! Dat picture of us be hella -273 doe."

"On da real? Oh snap, hella bromo-in it up! Hella negative doe! HELLA!"

"Finna be freezin wit dat -273 kicks doe."
by negativeswagnig November 07, 2011
 
1.
273
Acronym for "I'm missing you". Often said discreetly, just like 143.
Hey, 273.
by WENUSMAHMAN November 20, 2010