a person who acts like he/she dont know shit bitch.
Your a dumbfuck, jason. Stupid bitch.
A name your friend calls you when you know the anwser to a question and make it seem like you don't.
K: What's 2+2
C: 5
K: Your such a Dumbfuck
when someone does something really stupid, thats what you call them
Natasha, 'OMG JORDAN JUST TRIPPED OVER HER BAG!'
Kate, ' Haha... what a dumbfuck!'