What does FYIO mean?
For Your Information Only
Other definitions of FYIO:
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How to use the term FYIO:
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More slang terms:

Stan
An name for an obsessed fan. The term originated from an Eminem song featuring Dido called "Stan" about an overly obsessed fan, of that name, writing a letter to the artist.

DADT
Don't ask. Don't tell.

OMFSM
Oh My Flying Spaghetti Monster

WHATEVER
commonly used by teenagers as a way of blowing off their parents or as a point of contradiction