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."