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1.
Also, "f-ing the horse."

1. An expression used to define something detrimental to someone's career or livelihood.

2. Any action that has a harmful effect on oneself or others around them.

Taken from Daniel Radcliff's decision to star in London's revival of Equus, a play about a teenager with a sexual attraction to horses, causing parents to refuse to see any more of the Harry Potter movies in protest.
Howard Dean totally fucked the horse when he screamed during campaign season.

Tim was f-ing the horse when he decided not to go to class at all senior year.

Stacy's decision to pose for Playboy while on American Idol was really fucking the horse; it ruined her chances of staying on the show.
by Christina S October 13, 2007