idiom - calm down; chill out.

Usually used when somebody overreacts to a mild situation, requesting that they put their proverbial penis back in their pants.
"How can you eat veal!? Don't you know about the horribly inhumane conditions the baby cows are subjected to? It's an abomination!"
"Woah man. Put your pants back on."
by Eric Guan October 21, 2011
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