Top definition
A) Sitting low in the backseat of a darkened car while smiling so that only your grill can be seen, shining under the streetlights.

B) Telling your friend how to BBQ while at his home eating his food.
A) Backseat grillin' yo!

B) Sorry man, sometimes I can't help myself from backseat grillin' ya when you're leaving that BBQ open so much.
by Tron_Diddly August 11, 2014
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