An order to a male or female who is being irritatingly feminine, whining too much, talking too much, talking about pillows or gossip girl.
A girlfriend is talking for over 2 minutes about pillowcases, pillow shopping and bed linen to her boyfriend 'GIRL DOWN! PLEASE GIRL THE FUCK DOWN!

A man surrounded by a crowd of women suggesting that we should skip dinner because we had a sandwich for lunch "GIRL DOWN I NEED MEAT!"
by Randy Marsh 66 May 13, 2010
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