A slang reference to the sport of basketball. Probably stems from the fact that professional basketball players are predominately of African origin and basketball is an exceedingly prominent element of young black culture in America.
See also: nigger ball
Steve: Hey, Tim! I've got two free tickets to go watch the Lakers on tuesday. You in?
Tim: You bet! I love African Tree Hockey!
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On the drive back home I done seen a flock of niggers playin a game of african tree hockey!
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