The American Heritage® Dictionary of the English Language, 4th Edition
n. A game resembling soccer but differing mainly in that a ball caught on the fly may be passed with the hands and points may be scored by a forward pass over the goal line.
n. Slang An intravenous dose of cocaine mixed with heroin or an amphetamine.
n. A competitive variant of paintball with an equal playing field, contrasted with woodsball.
Word Usage
"Keeping up with Keef became a deadly game in the early 1970s, when heroin - usually mixed with cocaine and injected as a "speedball" - became Richards and his partner, Anita"