jimmy jackass 

offesive term that describes a flamboyant person who lacks a firm grip on reality

in mixed company "JJ" can be used

"Look at that guy! Swerving through rush hour traffic. While smoking and yakking away on the phone." "What a Jimmy Jackass!"

jimmy jackass by Courvoisier T. Johannsen September 28, 2006

jimmy jackass 

person whom you do not know, whom is acting foolishly.

Driver:" this guy in front of me is being a real jimmy jackass"

passenger:" ya i know he is swerving all over the road and doing like 35 WTF man!"

jimmy jackass by The Pi Guy17 February 18, 2011