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Combination of the abbreviation for, rolling on the floor laughing, and the "snork" sound, Tim Conway made during a skit on the Carol Burnett Show, mimicking two Siamese elephants joined at the Trunk , when attempting to Trumpet.
Used as an exclamation reply to something funny in text or chat:

Person A) "The first time I got a universal remote, I thought to myself, this changes everything."
Person B) "roflsnork!"
by Icova Rook March 11, 2017
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