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abbrivation for ( wah de mudda arse?!) aka what the mother's arse?! . an expression of shock and perplexity due to a seemingly unexplainable error or occurrence especially when perpetrated by others.
i saw my best friend with a very ugly girl... i just had to say ,wdma. WDMA?!

facebook keeps mistaking my incessant need to add friends for a spam-bot ... every time i am asked to enter a verification code i always say.'' wah de mudda arse?!''
by kyred007 August 13, 2010
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