Female that likes to be fucked by fingers. Amount of fingers needed depends on the horse.
"There are so many finger horses roaming around we may need to build a stable"

"Did u get a chance to take that finger horse out for a ride last night?"
by mccarthy and lynch September 30, 2005
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noun.
A horse finger is just what it says it is: a horse's finger, but if you have ever seen a horse; you would know that horses have no fingers, and that horse fingers don't exist. Which is why it is used as an insult, because if you call someone a horse finger you're saying that they are essentially nothing.
Person 1: You're a loser, a zero, a nobody.
Person 2: Yeah, well you're a horse finger
by Cannibus Indica April 21, 2004
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