A fastball in baseball lingo. It can also be used to describe a singular movement of increased intensity that is designed to bewilder another person.
Originally from the movie The Bad News Bears.
"Give'em the Heater Ricky!"
by J Dubya December 29, 2005
Get the the heater mug.
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
yo i know this nigga that brought out his heater and shot 2 shots up in the air
by A-M-R-O June 9, 2005
Get the heater mug.
To shove, forcefully, a fully-engorged penis into someone's rectum. Without lube and without warning. Causing a sharp rise in pulse, blood pressure, and sweat.
Guy A: "Bro, did you ever tag that Emily bitch?"
Guy B: "Please. Dude, I fucking ran 'the heater' on her."
by Bill December 15, 2004
Get the the heater mug.
A gun.
Any kind of gun.

It's called a Heater, Because when you pop shots off, You're attracting unwanted attention from the police. As such, The situation is getting "Heaty" due to the sound coming from the "Heater"
"Nine millimeter heater stashed in two-seaters"

- Eminem.
by ChillerTheBabyKiller April 22, 2005
Get the heater mug.
A quick, powerful punch. In most cases to the face.
Yoooooooo you see that?- Will
Nah what happened?- Jake
Ryan just hit that nigga wit a heater- Will
by ugotkuhmdawn February 11, 2020
Get the Heater mug.
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 4, 2011
Get the Heater mug.