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!!
The act of making a hole in the bed sheets facing your significant others nose, farting and lifting your legs up and down so that the scent is waft into their nasal cavity, bonus points if they start coughing
Person 1: my wife still isnt talking to me
Person 2: after that Belgian bagpipe
Person 1: yeah
Person 2: Haha nice.