Scooter from the GTA video
game series. It is a derogatory, effeminate play on the name of the Italian scooter brand Piaggio, as scooters (sometimes referred to as vespas) are generally perceived to be only a slightly less emasculating mode of transportation than the segway, the
pink tricycle, or an electric
barbie car.
Secondarily, It can be interpreted as a clear insult directed at the effeminate owners of such modes of transportation (see artfag).