Boy 2: "WAAH!"
Boy 1: "wow alright asshole ):"
The most common usage of 'waah', however, is when a group of friends are driving along a high street and shout 'WAAH' at individuals or groups of people. This form of 'waah' serves no particular semantic meaning or purpose, other than scaring the public or exposing the nation to the 'waah' phenomenon.
Old Woman: *Drops her shopping and screams in fright*
Group of friends: *Laughter*
Plural & possessive: Waah's