A fumb duck is a particularly stupid breed of dumbfuck. Its name comes from fucking up the insult 'you dumbfuck' where the insult obviously backfires.
Megan is a fumbduck.
by Beepo_girl May 11, 2006
I hate FumbDucks they are soulless idiots with no lives. I have yet to see a useful tweet or found a twit who can show me a useful tweet.
by Xannieria April 02, 2009
This Fumbduck says I'm stupid!
by Moronofus December 22, 2024