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1.
The act of doing completely random, strange, and weird things in public
Laughing randomly out loud for no reason while walking alone in public -GRANDing
by @grandICONiac August 07, 2011
 
2.
Showing off a new (or "new to you") vehicle by driving it around the block (neighborhood/park/lot) continuously. It is a shortened form of "grandstanding." Term is typically usually used in the Southeast by adults who grew up in the 80's.
Man, he been granding his semi-new BMW all afternoon.
by esquirej October 14, 2009