alternative way of deeming something "hot"
Have you heard the new Ghostface record? Shit's the heat.
by dlc March 1, 2005
Primarily used in the southern states (Alabama, Mississippi), "the heat" refers to a heat irritation which results from the thighs sweating and rubbing together while working or walking outdoors for extended periods of time. Conditions are made worse by humidity (on the Gulf Coast humidity is almost constantly at 85%+) and continued irritation, as experienced by construction workers.

General symptoms include:
-Redness
-Sensitivity of the area
-Discomfort while walking
"Ricky and the boys at work all got the heat so I sent a bottle of body powder with him to work today."
by Levi W. December 3, 2007
not only used to mean firearms or law officials, "The Heat" is sometimes defined as being hot or awesome. tmj
You're going to see Bright Eyes on Saturday? Conor Oberst is the heat!
by michelle March 29, 2005
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 1, 2019
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 8, 2015
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