In British slang, "pocket billiards" (or "trouser billiards") is used as a euphemism for a man scratching his genitals (or even masturbating) through his trouser pocket. The equivalent Americanism is "pocket pool".
As well as being a professional competitive activity, darts is a traditional pub game, commonly played in the United Kingdom (the first country to officially recognize darts as a sport), across the Commonwealth, the Netherlands, Ireland, Israel, the Scandinavian countries, the United States, and elsewhere.
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