1 definition by Joey Boycie, everyone's favourite bassist

A word used to emphasise ones pleasure and/or approval at something. Often accompanied by spasticated clapping.

For real authority, one should pronounce it as if saying 'I SAY! (old chap)'.
Bloke in movie: "The Wooden Horse will destroy the city of Troy".

Loyal fans: "Hazah! Hazah!" *clap clap clap*
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