The French expression à poil refers to body hair - when you are à poil, you're wearing nothing but your own hair. It's equivalent to the English expression "in one's birthday suit," and can be used as an adjective or as a command in numerous expressions:
être à poil (to be stark naked)
se baigner à poil (to go skinny-dipping)
se mettre à poil (to strip down to one's birthday suit)
un mec / une fille à poil (a naked guy / girl)
à poil ! (Take 'em off!)
Example:
N'ouvre pas la porte - je suis à poil !
Don't open the door - I'm completely naked!
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