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1.
a combination of being mixed up and confused.
Sugar violas? I'm mixfused.
by Bungalow Bill January 13, 2002
 
2.
The feeling you get when you've been studying something all day, but come out of it with the feeling you haven't really learned anything.
After coming out of a painfully hard Maths exam :
"Well now I'm mixfused!"
by Mixfused MCB February 09, 2004