Definitions by Schlongzilla (MJB)

dunk biscuits 

A term used to describe inserting ones testicles into another person's anus. It has become a stereotypical act of the homosexual community in the highlands.

Apparently they took it in turns to dunk biscuits, if you know what I mean...

dunk biscuits by Schlongzilla (MJB) January 10, 2012