Its a typo.
someone attempts to type 'lol'
And suffers from FFS (Fat Finger syndrome in ths case)
That person is then mocked, but it catches on, and becomes synonymous with them on that forum/discussion board.
an example smiley..
tehpix.com/tehpix/files/1/lool.gif
-bob- that was funny.. lool..
-cat- Hahaha! you said lool!
-bob- I pwn LOOL!
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