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1.
An exclamation used to calm someone down when they are being overly obnoxious or excited about something stupid or insignificant, similar to chill out or relax.

Usage has nothing to do with whether the object of the phrase actually has tits.
Sam-"Jimmy, come ONN, give me a piece of Wrigley's supermint."
Jimmy-"Chill your tits."

Ninth Grader-"Oh my god, those girls are sooo hot, i like the one in blue. Do you think i should go talk to her?"
Eleventh Grader-"Chill your tits, kid, it's just a sixth grade birthday party."
av Gage Magz 10 mars 2007
 
2.
an exclamation to describe when someone is overly excited/worried about something.
Danielle: Austin is balding!
Mikaela: Chill your tits.
Danielle: Awkward. I don't have any.
av AnielleDay 12 november 2011