To take the piss when someone has just said something dead and is a 'flop' when if it was funny would normally be followed with a 'ya dun'kno'
by breh123 September 5, 2011
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ya dun flop • Ya dun fucked up • Ya dun goof'd • ya dun fuck'd up now • ya dun goofed • Ya dun know • Yadun • ya mum • YA-YA • ya