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A replacement for the words "relax" or "chill". Although in this sense it would be to tell something to relax or chill. Must be said with confidence and swagger or no effect is had.

Pronunciation: {Grill-Till} (emphasis on the suffix -TILL)
"Watch out for that deer! You almost ran over it!!"
"Griltil bro, I got this"
by Ujembido March 25, 2013
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