A persons ability to ride a motorcycle properly and know what to do in a panic situation. this person won't have chicken strips on his tires and will know more then the basic skills that is required by the DMV.
Kurt was on his way to hooters and went into a turn too fast. luckily he's a trackrider and knew to use trail braking to make the turn without causing an accident.
An annoying prink who latches onto your exact walk speed and trajectory and then continues to follow you 'up your arse' all the journey. Can only be stopped with a sudden halt, which may result in a rear-ending, depending on how closely they are following you. Also applicable when driving.
E'yar mate this dickhead behind us is being a right arse-rider! He has followed us all the way home. I am about to slam on the brakes, hopefully he fucks off.