Top Definition
Abbreviation/acronym for: Licks Finger (and) Strokes Imaginary Wall

This is done in a show of one-up-man-ship, as in "one to me" or "score one point to me".
LFSIW - In real life it is performed by poking out the tongue, the index finger is licked, moistening the tip and the hand is outstretched in front of oneself (other fingers closed to make a "point" sign) and wiped in a downward motion, as if to make a mark in the dust of a chalk blackboard.
by JoLLyMaKo June 10, 2009

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