The act of removing a person's chinstrap, you then singe the skin where the chinstrap was with a blowtorch. This creates an anti-chinstrap as the hair you burned will not grow back, however the other hairwill
Guy 1: I heard the took Matt and gave him an anti-chinstrap.
Guy 2: Yea, now his face looks realweird.
When you wake someone up by bashing your testicles against either side of their chin alternately, mimicking a church bell, it is most commonly done by people from the north, hence its name.
John: The divorce couldn't have gone smoother after the scouse chinslap I delivered the other night!!