What does FYFI mean?
For Your Fucking Information
Other definitions of FYFI:
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How to use the term FYFI:
There are no example uses of FYFI at this time. We would greatly appreciate your contribution if you would like to submit your own!
More slang terms:

SMTOAY
Sticking my tongue out at you

BATS
Better-looking across the street

TOYA
Thinking Of You All

FASHO
For sure