Heroin. As contrasted with white pony, slang for cocaine, in the 1983 pop hit "White Horse" by music group "Laid Back".
"If you want to ride, don't ride the white horse."

"The TV Show 'Twin Peaks' used a white horse to symbolize heroin addiction."
by hackerb9 November 03, 2007
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Street Definition for Cocaine Methamphetamine, and Heroine
Riding the white horse means to be high off one of these substances listed above
by Barz the Phoenix April 24, 2016
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Linked to instinct, purity and the drive of the physical body to release powerful and emotional forces, like rage with ensuing chaos and destruction. Most notably from Rob Zombie's Halloween 2.
Guy: Why is he killing everybody?

Other Guy: He has visions of a white horse.
by Jmanbandit September 06, 2009
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In a relationship, when the couple fights and breaks up, the girl will usually refer to the guy's charm in getting her back as his white horse.
"It's too late for your white horse to come around."
by Pencilcharm April 03, 2010
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