A playful, idiomatic way of saying someone is completely naked — wearing nothing but their 'birthday suit,' the skin they were born in.
A playful, idiomatic way of saying someone is completely naked — wearing nothing but their 'birthday suit,' the skin they were born in. 'Birthday-suited' is the adjective form, used to describe a state of full undress with a lighthearted wink. It's one of those euphemisms that is charming rather than crude — you'd use it in comedy, casual storytelling, or when describing accidental nudity without wanting to be blunt about it. The phrase keeps things funny rather than explicit.
The toddler escaped from his bath and went running down the hallway completely birthday-suited, much to everyone's delight.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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(slang, idiomatic) Unclothed.