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Keep your shirt on is an old phrase used in a time when men would take off their shirts before they got in a fight. A classy way of saying chill out or don't over react
jim "I want to f*** him up!"
sally "keep your shirt on"
by gojanego1234321 September 12, 2009
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2
it means that you have no need to act all polite or formal. It also means that you dont have to be such a stuck up person by trying to act cool all the time.
Seller: Buying something?
You: I might be. Leave me be.
Seller: Yeah yeah..keep your shirt on.
by Artemicion April 14, 2016
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