Top Definition
knacker whistle the act of whistiling with your tongue while raising one or both hands in the air, usually done when celebrating something, i.e sporting victory, as a method to gain the attention of a person in the distance, has being known on occasion to be used while intoxicated to stop passing taxis
after a victorious race the stroke man gave a knacker whistle to celebrate
by badman septic tank July 19, 2010

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