Originally Posted by Red__Zed

horse
A game played to practice basketball. One player attempts a shot. If the shot is successful, the other player must make the same shot in only one attempt, or gain one letter (HORSE). First one to spell "HORSE" loses.
Mom: What did you do after school today?

Zach: Just played a few games of horse with Ryan.

Originally Posted by urban dictionary

1. horse

Heroin.
Keith Richards did so much horse in his lifetime that his blood type is China White.