When an animal (humans included) is so horny and eager to mate, that they'll hump whoever comes along.

Some people think that only females experience this state, but male animals also have a reputation for being achingly randy.
"Great...! Just great! We forgot to neuter our cat, and now she's in heat! I can't stand the howling!"

"While in Frankfurt (appropriately), I once asked a German storekeeper for a 'heißer Hund'- literally 'a hot dog.' He burst out laughing, as 'heißer Hund' in German suggests a dog in heat." -Richard Lederer
by Lorelili February 6, 2006
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1. (Adj.) Warm. To be raised in temperatature.
2. (Adj.) Angry, annoyed, pissed off, frustrated, etc...
3. (Adj.) Intense.
1. "Yo dawg I just heated up this Instant Lunch™ you want some?"
2. "Fuck man my source didn't come through with my eighth I'm so fuckin' heated..!!"
3. "Check it out that fight's getting heated over there."
by A New STD June 20, 2004
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What happens when you touch some weird ass roleplayer’s ears and/or tail
Roleplayer 1: *Touches Roleplayer 2’s ears*

Roleplayer 2: “N-Nya! *She’d hide her tail and ears* Don’t do that! I’m gonna go into heat!~ My Ears are very sensitive you know!”

Roleplayer 1: ....
Roleplayer 1: Bitch-
by Why the fuck am I here April 22, 2020
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Gun(s)
We gotta pack some serious heat for this drive by
by AC October 22, 2003
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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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