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1.
the rusult of being burned so bad your still studdering in amazment at the other persons comment
Q: dude did you hear what tom called jeff?

A: yea after that he was totally dumbfucked.
by sumoman25 March 11, 2009
 
2.
An expression of sheer stupidity
All he does is sit in class looking dumbfucked.
by ATM April 08, 2005