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22.
A gun, not always loaded, typically a 9mm hand gun. Used if loaded to shoot(DUH) Unloaded good for a bluff.
Dally: We can't walk alone at all. I started carrying a heater...

Ponyboy: Dally! You kill people with heaters!

Dally: You kill 'em with swtichblades too don't ya kid? Don't worry it ain't loaded. I ain't aimin' to get picked up for murder. But it sure does help a bluff.
by Littlexxpuppet January 03, 2011
 
23.
An inanimate object that emits heat and talks to you when you are alone and tells you very mean things. Best way to get rid of it is to kick it.
I was sitting in my room, then my heater started.
by Varishmere April 04, 2011
 
24.
a glock, neener, or any other type of firearm.
"He don't wanna see me, and da heater!"
by intake January 09, 2003
 
25.
A really huge, deep, painful zit.
Wow, I got the biggest heater on my forehead! Hurts like a bitch!
by Noodle2 March 19, 2011
 
26.
An apparatus meant to provide heat.
It's cold in here. I guess I should turn on the heater.
by Emma February 04, 2005
 
27.
A cigarette. A dart; square. An amount of tabacco rolled or made for use of smoking.
Man, Chucky was so drunk last night, he threw back like a whole pack of heaters.
by Austin Tyrrell December 07, 2007
 
28.
a gun usualy a .45 colt 1911 a popular handgun of the 1930's
"Tommy make sure you pack a heater for this job."
by .911.AZBDC December 29, 2007