(informal) Humphrey Bogart (1899–1957), American film and stage actor.

A ghost, goblin, or other hostile supernatural creature.

(figurative) A bugbear: any terrifying thing.

(engineering) A standard of performance set up as a mark to be aimed at in competition.

(military, aviation) An unidentified aircraft, especially as observed as a spot on a radar screen and suspected to be hostile.

(military, aviation, slang) Synonym of bandit: an enemy aircraft.

(golf) A score of one over par on a hole.

(UK) Alternative form of booger: a piece of mucus in or removed from the nostril.

(UK, engineering) A bog-standard (representative) specimen taken from the center of production.

(Australia) A swim or bathe; a bath.

Alternative spelling of bogie (“one of two sets of wheels under a locomotive or railcar; also, a structure with axles and wheels under a locomotive, railcar, or semi which provides support and reduces vibration for the vehicle”)

(golf) To make a bogey.

(Australia) To swim; to bathe.