internet acronym for "Fuck Yeah!"
(people often mistaken the "!" as an inverted "i" expecting it to be FYI or "for your information")
Dana : Seen that movie?
Ray : FY!
Dana : IKR?
Swedish word meaning the same as "Fie!" in obsolete English. Like saying, "Shame on you!"
A Swedish mother will reprimand her naughty child by shaking her index finger at the child saying "Fy, fy, fy!"