Top Bunk

Top bunk is a lighthearted slang term for the top, the person taking the active or penetrating role during sex. The joke draws on the image of bunk beds, where the top bunk sits "on top," giving people a coy way to signal a role preference without stating it plainly. It belongs to a long tradition of queer slang that treats frank talk about sex with humor and wink. The phrase is casual and informal, more likely to show up in flirting, dating apps, or banter than in clinical or formal writing.