The phrase used to describe the event in which one person makes another person "flinch" via pretending to punch them, pretending to throw something at them, or through any other agressive action in which you do not actually touch or hit the subject. If the person flinches (just blinking does not count as flinching) from this action you have the right to say "ride it." When said the guilty party (the one who flinches) must grab your arm which you will hold at a 90 degree angle and the guilty party must grab onto it with either hand and with the other hand must hold it up and twirl it with one finger up as if they were signaling a homerun. Depending on the severity of the flinch, the victim might need to make noises. "Riding it," is a sign of respect for the person who is being rid.
stefan: you flinched ride it pussy
greg: stfu i didnt flinch
mike: yeah you did you little bitch
greg: ok fine