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Something that is of such low quality it becomes worse than horse shit and dog shit put together.
-Have you tried Better buy orange juice?
Yes, its horse dog!
by solomonf January 11, 2009
A near-mythical creature that resembles a large dog much like a great dane but with an unusually elongated nipple. He roames the streets granting wishes to those cunning enough to catch him.
Matt: "Hey did you just see that?"
Jeff: " Oh yeah, that's horsedog."
by Deuce1398 October 15, 2010