A combination of Chill and Relax, the most fucking infuriating word there's ever been.
Guy 1: Hey man just Chillax

Guy 2: I am going to urinate inside your eye sockets after they've been ripped out and sown into your scrotum if you ever say that to me again

Guy 1: Come on now, just Chillax...
by xxx_mlggoprobrolololololo_xxx January 22, 2021
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A combo of 'chill' and 'relax'. Possible one of the most try-hard words out there, very irritating too.
Normal Person: So what are you doing on Saturday?

Try-Hard: I'm gonna chillax
by i don't know my name August 15, 2007
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A mixture of the words chill and relax
except it seems to be there two words multiplied so its a sort of extreme relaxing.
Can be used for when you are sitting in your garden on a summer evening with a beer listening to 'Time of the Season' by The Zombies.
Or if someone is having a major freaker and going ape shit at people you can tell them to chillax.
by Black_Rose_325 September 26, 2008
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Metaphorically speaking, a "drug" a person will tell another to take when their level of stress or aggression reaches profound heights in which it is now useless to merely tell them to "chillax".
"It's no big deal, dude... You're girl came onto me, but I didn't put it all the way in, so just take a chillaxative!"
by atom project April 11, 2008
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Obvious portmanteau of "to chill" and "to relax".

Originated in the Netherlands, where students (both foreign and Dutch) spent so much time chilling & relaxing that both regular words were simply not strong enough to describe the constant and intense state of relexation said students were in.

It is used the very same way as "to chill" or "to relax" but has a slightly stronger connotation.
"Dude, you wanna come to the club tonight?"

"Nah man, I stay at home and chillax"
by BigBadBastard March 31, 2009
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