Noun, a cigarette, smoke, stoag, butt.

In poker, a heater is a period where a player is getting better than average cards. Heaters don't theoretically exist, but they appear to exist on a player's graph. Can last for a very short while or a very long while.

slang term for a fastball.

slang for cigarette; term mostly used in minnesota

a glock, neener, or any other type of firearm.

noun : an exceptionally attractive person; one that heats; especially: female.

a gun, any kind of gun, due to shots going off, the gun tends to get hot, so they call it a heater caz you put it in your pants when u done