Top Definition
complete fits of silent laughter. used instead of something like pmsl (pissing myself laughing) or lmao (laughing my arse off).
in msnmessenger / aol messenger etc.:

A:iv got a joke for you
B:wow, go for it
A:why did the chicken cross the road?
B:dunno
A:because he felt like it
B:hah! CFOSL! that was hilarious. mental!
by fran and christine January 22, 2006
1 more definition
5 Words related to CFOSL
complete fits of silent laughter. used instead of summat like pmsl or lmao.
in msn or summat:

A:iv got a joke for you
B:wow, go for it
A:why did the chicken cross the road?
B:dunno
A:because he felt like it
B:hah! CFOSL! that was hilarious. mental!
by fran browne(with an e) January 17, 2006

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