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1.
Someone attempting to use logic to make a point in an arrogant and egotistical manner despite their argument being somewhat shaky.

Opposite of High Horse.
A: He keeps banging on about Italy being a shining example of government despite all of the obvious things wrong with that place.

B: Tell him to get off his f****** low horse
by NewArtRiot November 29, 2010
 
2.
A small horse with short stubby legs and kankles, which typically are hairy, and come in brown, purple, black, white, and chartreuse. They are typically used as a form of delivery or transit.
I'm going to send you away on a low horse. Their legs are short so they walk like this.
by grrface October 25, 2007