Bottom Bunk

Bottom bunk is a lighthearted piece of slang used to say someone is a bottom, meaning they take the receptive role during sex. The joke borrows the image of a bunk bed, where the lower berth stands in for the "bottom" position. It is casual, affectionate humor rather than a formal or clinical term, and shows up mostly in gay and queer conversation, memes, and dating-app banter. Like "top" and "bottom" themselves, it describes a preference and a bit of self-deprecating fun rather than a fixed identity, and no one is obligated to a single role.