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Douglas Harper's Etymology Dictionary
horndog

by 1995, from horn (n.) in the sexual sense (see horny) + dog.

Wiktionary
horndog

n. (alternative spelling of horn dog English)

Usage examples of "horndog".

But men liked to imagine that such women did exist -- to imagine, in other words, that some women could be such indiscriminate hump-anything horndogs as men.

Sure, you'll hear tell of some high-placed corporate honcho or honchita horndogging after a bit of crumpet, but you can bet your T-bills that they lock up their assets first.

Those females were way too used-up to cop even a second banana role in any teenage horndog fantasy-overweight and overworked-just your typical sad sweet old black ladies that life had been shitting on for about four hundred years, about as sexy as a bag of turkey necks rotting in the noonday sun or a hippopotamus's asshole with a wad of toilet paper hanging off it.

Those females were way too used-up to cop even a second banana role in any teenage horndog fantasyoverweight and overworkedjust your typical sad sweet old black ladies that life had been shitting on for about four hundred years, about as sexy as a bag of turkey necks rotting in the noonday sun or a hippopotamus's asshole with a wad of toilet paper hanging off it.