Stands for "For Your Information"
Mother: I bet you have been the whole evening with your friends.
Daughter: pfff, f.u.i, i was at the library studying
by Loyda Quintana January 07, 2008
Variation on phooey. Contempt or disgust towards something perceived as complete bullshit.
Q: Hey, have you tried Amway?
A: Fui!
by AtomSmasher October 29, 2004
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