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1.
The act of chilling, or hanging with the bros.

Origins: John Jay High School
"whatsup dude?"
"Nothin i'm just crilling"
by Anonymous McAnonymous May 19, 2008
 
2.
Chilling (as in 'hanging around' and 'looking cool') and grilling (as in 'grilling burgers') at the same time.
Frequently happens at parties and barbeques.
Involves grilling a burger and looking relaxed/being cool.

Air-crilling -
Pretending to crill. Looking like you are grilling/flipping a burger and pulling a face in an attempt to look cool.
'Are you making burgers?' 'No, I'm just crilling.'
by snailonskates March 06, 2012