The slang phrase XYZ, meaning “examine your zipper,” has been used since at least the 1960’s as a subtle tipoff to let someone know his zipper is down. A variant, XYZ PDQ, means “examine your zipper pretty darn quick.” Other surreptitious suggestions for someone with an open fly: “There’s a dime on the counter,” “Are you advertising?”, and “What do birds do?” This is part of a complete episode.

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