The sound made (a little like a duck's quack) when somebody does/says something stupid or is on the receiving end of some bad luck or event. Occasionally, the word can be repeated for extra effect.
Lauren: 'My grandma just died'
Laura: 'Mwak'

Laura: 'I just feel like my career is going nowhere'
Lauren: 'Mwak mwak'

Lloyd: 'I didn't know you could put foil in the fridge?'
Jess: 'Mwak mwak'
by Lord Lloyd Christmas November 05, 2010

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