knacker whistle 

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

knacker whistle by badman septic tank July 19, 2010