The Shnigg is a colloquialism used to descride the release of bodily fluid through self-masturbation. When performed by oneself it is called Shnigg however if performed by another person on you is is called the semi-jaunt (Jaunt).
This word was coined by the BSE and is now used in Bolton Street and its environs.
Did you get the semi-jaunt tonight Sean?
I am going for a shnigg.
Want to see me shnigg?