Etymology

I'll be in my bunk

Today it means: Used to imply that one needs to excuse oneself to privately indulge in a pleasurable activity, particularly masturbation. Full definition →

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The story

From a scene in the episode "War Stories" (2002) of the television series Firefly, in which Jayne Cobb reacts to seeing courtesan Inara walk off with a female client by stating, "I'll be in my bunk."

Etymology from Wiktionary, CC BY-SA 4.0.