1. A hit song by Katy Perry
2. Someone supposed to bring about the apocalypse
3. Someone who is unnoticed but shocks everyone with a great performance.
When he won at Watkins Glen, AJ Allmendinger went from dark horse to recognized road course specialist.
by fajlkg sdfjkldfs ;jksaj djdfk; November 10, 2014
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To Dark-Horse (verb)

To act in a sly or secretive manner, rarely letting others know what you're doing, where you're going, or who you're going with.

Being a very shady character, and being quite quiet are essential to perfecting this action.

A good poker-face is obligatory, of course.
I saw Ryan buy 4 different cards for Valentines Day, he is such a Dark-Horse, i never know what he's up to.
by Herr Gilbert February 14, 2012
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A sexual act where one naked man sits on another mans hairy back in the riding position and jerks him off from underneath, and just before climaxing the 'horse' is forced to neigh and the 'jockey' shits all down his back, making a tail.
"Yo Steve we're doing the dark horse tonight."

"Please noo..."

"Please yes big boy"
by JohnEBlaze August 01, 2009
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v. the act of engaging in sexual acts with some one who has passed out.

n. a person who darkhorses
"I heard Julie and Marvin had sex last night."

"Actually, Julie was darkhorsed."
by obietrice303 November 13, 2007
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anything mysterious, dangerous, unusual, unexpected, confusing, or sketchy

synonomus with "sketchy"

when you see a man walking around at midnight, you might say that he is a darkhorse, or that the situation is darkhorse because that is an unusual event
basically this word can be used in any form

ex. "that guy is a major darkhorse" (that guy is mysterious)
ex. "that game was so darkhorse" (that game was confusing)
ex. "darkhorse!" (exclaiming that something is sketchy)
by wordwizard01 September 03, 2011
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A pretty awesome comic book company, responsible for all the Star Wars comic books and graphic novels, among others.
You can pick up Dark Horse comics at your local comic book store.
by Escalus August 27, 2005
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Black Dick

The word dark as you know means not lit up or shady and horse is flat out another way to say dick
Last night after we got out from the strip club I got me a dark horse if you know what I'm say in
by Dix sucker 3000 gay af June 16, 2016
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