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