Definitions by Rupert Forsyth

grunding 

The act of stimulating one's grundle using slow, clockwise, circular motions. One doing so without disruption of their natrual breathing pattern becomes a professional, grunder.

Steve reveals his beetroot, shiney, Jewish nose and begins furiously grunding Atilla whilst plundging his throbbing licker into his copper badge.

grunding by Rupert Forsyth March 1, 2007