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1.
to become so calm and relaxed, almost in a state of quiet ecstasy, that anything in your life that makes you say "fuck!" no longer exists
Bob: Erin, what are you doing today?
Erin: I'm going to chill the FUCK out.
by aieuo September 20, 2009
 
2.
something i said to some cutty ass bitches that got them to jump out of the car and rob me
cutty ass bitches: Get out of the fucking road
Me: CHILL THE FUCK OUT
cutty ass bitches: WHAT THE FUCK DID YOU SAY
by niggaandshitdawgcutty January 01, 2008