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1.
Fear I Missed out
Ferdinand: I looked at all the sweet pics of that festival you guys went to on FB and i now i have massive FIMO.

Dave: You should lad, it were grand.
by soupdragon August 17, 2013
 
2.
An expression to end a discussion topic when it starts to drift, becomes tiresome, or has no apparent end or solution.

acronym for "Forget It Move On" or "F*** It Move On”

pronounced feemo
..guys, where getting nowhere so lets FIMO this topic...
by goatdude March 12, 2008
 
3.
An expression to end a discussion, conversation, or just for leaving.

Acronym for "F***it I'm Out"

Pronounced feemo
... This party sucks. FIMO!...
by _FIMO_ November 02, 2009