A game played, usually at a casino, to spot the girl with the bruises on her knees next to the high rollers.

The girl is considered a horse because she'll let you ride upon her for a small fee. Other common terms for such a girl would be golddigger, casino whore, money whore, etc.

NOTE: This game is typically played by minors who are not able to gamble yet.

(Originating in Atalntic City, NJ)
We went down to AC (Atlantic City) to play spot the horse since we couldn't gamble yet.
by AC Representative December 22, 2007
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