Acronym for Laugh At His/Her Failure. Used depending on the sex of the one whom fails. Used with EMPHASIS and only when the given person TRULY fails miserably.
Person A: fails a trick on his skateboard and ultimately performs a humiliating nutter.
Person B Says to Person C: OMG LAHF!!!
Persons C & B start to laugh hysterically.
by D. Emson April 14, 2008

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