When someone does something awesome, but continues to milk it for more than it is worth. When your friend gets an amazing kill in a Modern Warfare and continues to brag about it.
Guy 1: Dude did you see that I got a head-shot on that guy from across the map.
The being that is the wearer of spandex and rides their bicycle as if he and or she owns the road and is indeed a motorized vehicle warranting the use of a full car lane.