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It's a word put together from Chillin' and Relaxing. It actually means the same. If somebody should cool down you could say he or she has to relax or has to chill out. If you decide not to choose between these to, or you haven't made a decision while you already have to say the word, you say 'Chillax'.

It could also mean having a good time with your friends.
Woo man, don't get so angry, chillax a little!

or

Hangin' out with my homies today was super chillaxed.
by Jasper Vondeling August 27, 2007
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Jun 24 Word of the Day
An exclamation made when your friends or family are teasing you to a point where you can't handle it anymore and a hissy fit is in order.

Derived from a YouTube user's famed outburst following Britney's lackluster performance at the 2007 VMA's.
Sarah: 'OMG Susan, I can't believe you are wearing the same skirt as yesterday. Oh, and by the way, EVERYONE knows what you did with Kevin on the weekend. Plus you look a little fat, are you retaining water?'

Susan: 'LEAVE BRITNEY ALONE!'
by Billy Chickenhole September 15, 2007
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2
becoming relaxed by chilling with your friends
i have been chillaxed since i went to rachels house
by naomier April 05, 2006
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5
to chill (to cool down) and relax at your pace
I chillaxed as I played with my pussy and smoked a joint
by Kit Kat June 23, 2006
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