Heat is the stage of their reproductive cycle ( pre-ovulatory period - estrus ) when the woman feels more attracted by men, in order to get pregnant.
"The woman is permanently attracted by men, but, during their heat, that attraction is even more intense".
by Willhelmina Plowes June 08, 2015
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When your pet hella horny and will fuck anything in sight
Garry: why is your cat humping the couch arm?
Sbeve: he's in heat
by Yiff yiff fur boy August 01, 2019
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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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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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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 05, 2006
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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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