Definition of fof

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fof is short for "frown on face." Started by the Engadget podcast it is the opposite of lol.

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Funny or Fact. A hapless tweeter who starts many tweets with "That awkward moment when..." and ends with "[noun] [verb present]" thereby creating a syntactical fragment.

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Friend or Foe, a military term. see http://en.wikipedia.org/wiki/Identification_friend_or_foe