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1.
an attractive person who stands in the corner of your room, radiating heat for your enjoyment. very useful flirting technique
OMG IM SO COLD

Don't worry I'll be right over. I am your radiator after all.
by Jefferson's Toenail December 29, 2010
 
2.
A handgun
You will get smacked with the radiator if you keep fucking with me.
by younggunz28 July 25, 2010
 
3.
(noun) a protruding gut that needs air to breathe (see Duane Pierson)
Hey man, look at the size at that guy's radiator.
by ken mance January 30, 2007