Hazaah is a type of onomatopoeia, devised while me and my friends were doing bugsy malone. It is used to show a group celebration about a particular event.
One person announces, "Hazaah for "insert object/name here" and then in responce, everyone shouts out "Hazaah!" in a celebrating type fashion.
This celebration is reserved only for males. If any femenists are reading this, then dont get too offended, just go and invent your own celebration
Darren:"Hazaah for hitting one of the staff with a custard pie!"
Every male: "HAZAAH!"