A special fighting-techinque involving squeezing someone's testicles in the rythm of heartbeats. Often used in boarding schools.
Guy 1: "Are you mugging me off in front of my pals?"
Guy 2: "Nooooo!"
Guy 1: "Yes you are!"
{Guy 1 grabs Guy 2's testicles and squeezes them according to the rhythm of his own heartbeats.}
Guy 2: "Aaaaaaaaaaaaaaaaaaaaaaah!"
Guy 1: "Now jogg on, dickhead!"