1. Any daredevil on a Ninja style motorcycle who gets his thrills in traffic by weaving in and out and around cars without respect for other drivers/pedestrians/cyclists.
2. A young inexperienced biker who races and does wheelies in traffic, resulting in a fatal accident.
On my back bumper, these three weaver monkeys were trying to intimidate me by weaving back and forth on their bikes, then they gunned it down the right hand shoulder and into the mini-mart lot.
Jack, pull over in to the right lane, we got weaver monkeys in back of us.