To express extreme displeasure with something or someone. Another form of "uncool" or "not cool".
Guy 1-"Hey man I clogged your toilet."
Guy 2-"Dude, negative cool."

Girl-"Baby.....I'm pregnant."
Guy-"............Negative cool."
by Hells Pastry August 27, 2008
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A phrase used to mock someone that is not cool or doesn't have "cool points". (Cool points are entirely made up and based on a number scale dealing with how much someone likes you.)
John: Hey, did you see those girls?
Sean: Wow, they're pretty gay.
John: I know. Negative infinity cool points!

John: Ellie, shut up. Negative cool points for you!
Ellie: ....you have no life....
by Moni-chan13 December 10, 2006
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