Meaning

noun United States film actor (1899-1957)

originFrom actor Humphrey Bogart, from Dutch surname Bogaard (“keeper of an orchard”), from boomgaard (“treegarden, orchard”), cognate to English boom (“piece of wood”)/beam + garden. Senses of selfishness and excess evolved from the original 1960s use meaning “keep a joint in the mouth instead of passing it on”, recalling the actor’s signature practice of keeping a cigarette dangling from his mouth…

Etymology from Wiktionary, CC BY-SA 3.0