Heat has several meanings as a word and one as an abriviation.

Heat as a slang term is commonly used to describe a weapon of some kind, usually a pistol. "You packing heat?"

Heat as in heat generated by an exothermic reaction is an increase in energy of particles causing them to move/vibrate more rapidly, in some materials this can cause electricity to flow more easily, for materials to melt then evaporate.

When an animal "goes into heat" they are at their most sexually active and reproductive time of the year, this would usually occur during the "mating season" of the particular animal.

As a military abrieviation, HEAT means High Explosive Anti Tank. This is a rocket or other explosive missile/shell designed to penetrate through a tracked vehicles armour before detonating it's explosive charge to disable/destroy the target. (For those of you wondering, there is such a thing as "low explosive")
"Hostile armour spotted, load up a HEAT round, let's take it out."
by MarineJulio April 6, 2005
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ur animal is horny lol get it neutered.
Bro: Dude why is my cat laying down with her butt up?
Dude: Bro she’s in heat.
by ahahhwjajbwahh July 5, 2019
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to get mad,like if u are bout to fight someone
"that nigga got me so heated, i was bout to kill him"
by *lil h0mie* July 22, 2003
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1. A gang/mafia term regarding the illegal traffic of guns. This references how a automatic type weapon heats up with prolonged use and how stolen goods are "hot".

2. Also, referring to the act of selling or using these guns. Particularly in assassinations. This is in conjunction with the word air-conditioning

3. A cover for a gang/mafia business in illegal use of weapons.
"I put in some heating for Doug."

OR

"I work in the heating business."
by 5n1tch September 6, 2011
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