A dykehorse is anything that is being retarded. It can be an object or a person, doesn't matter. The word originates from an all girls prep school in Phoenix, AZ. It is commonly used among the prettiest and most popular girls.
Channing- Did she just trip over air?

Liz- YES.

Channing- Dykehorse!
by fishbish1 February 14, 2011

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