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1.
Telling a specific person or group to calm down or chill out.
Person 1 - "Oh my god! I just failed my math test!"
Person 2 - "Bitch, calm yourself!"
by Ron L.. October 10, 2006
 
2.
"Calm Yourself" is a way to tell someone to shut the fuck up without sounding to rude.
Trey: Did you hear about sally the dinosaur?

Marcus: Calm yourself "shut the fuck up trey"
by BOWERS--- June 03, 2010