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Acronym, based on "Rolling On the Floor Laughing" (ROFL); Rolling On the Floor Laughing And Laughing And Pissing Myself And Scaring The Cat. Generally used for more extreme cases than ROFL or ROFLMAO.
What is that on your head? Are you wearing a chicken hat? What?? It *is* a chicken? ROFLALAPMASTC!
by William Bryson July 24, 2006