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1.
A combination of the words "fuck" and "duh". Usually a word used to replace "fucking duh." Often used to show a high emotional reaction to an obviously stupid statement.
"Hey, I see you cast, did you break your arm?"
"Um.....fuckduh!!"
by Justin Kelly May 09, 2008
 
2.
A combination of the words "fuck" and "duh". Usually a word used to replace "fucking duh." Often used to show a high emotional reaction to an obviously stupid statement.
"Oh, so you broke your arm?" "No fuckduh!!"
by Justin Kelly May 08, 2008
 
3.
when something is so obvious.
"yo that bitch is wack"
"fuck duh"
by emmaDISEASE September 26, 2006