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1.
Sad noise coming from an annoyed, unhappy depressed person, e.g child...
"My head hurts.. waah"
by Kamber August 06, 2005
 
2.
a word used when a person is frequently bitching or complaining about something. a perfect example is that person in the backseat of the car on the snickers commercial.
Boy 1: "duuude im so tired of walking my legs hurt so bad!"

Boy 2: "WAAH!"

Boy 1: "wow alright asshole ):"
by anttwoonnnn May 01, 2010
 
3.
A word, or exclamation, that can be difficult to define due to its context. The word can be used as a greeting when uttered quietly, usually accompanied by a nod or salutation. It can also have an expressive function, as an expression of anger or frustration. Used in this context, it functions as an abstract noun, as one may be in a state of 'wah'.

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.
*Group of friends driving down a high street* "WAAAAAAAAAAAAAAAAHHH"

Old Woman: *Drops her shopping and screams in fright*

Group of friends: *Laughter*

Plural & possessive: Waah's
by Richie-G July 10, 2011
 
4.
A Shorter, Easier way of saying 'Don't Cry about it'.
Steve "Why didn't you turn left there it would have been so much quicker?"

Joe "Waah mate fucking waah"

Steve "fuck off!"
by b3no August 20, 2009
 
5.
it means waah. people say it. its not only for children.
A person might be walking down the hall, and decide to say "waah". You know what it means.
by Aibek A. March 03, 2008
 
6.
Directed at anyone who complains about anything.Originated on Howard Stern where Artie would say "Wah" in response to the most heartbreaking stories.
Man #1: I was raped and then lost my house because I couldn't work.
Man#2: Wah!
by FrankinQueens June 22, 2005
 
7.
Meaning similar to "Hell YEA!" or used to express that something is legit or awesome.
Guy 1: "Holy shit dude!! I just did three backflips in a row!!!"

Guy 2: "Waah!"
by King of Street Knowledge February 12, 2011