Top definition
The act of grunching for a sustained period of time. Self fistation, a period of masturbation through the act of fisting yourself in the arse with resultant fecal leakage, and possible blood loss.
Doctor: What seems to be the problem here Nurse?
Nurse: Im afraid its another case of blood loss
Doctor: To get your grunch on you have to be more careful
by The real Tyler James August 28, 2008
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