1 definition by Canadian Night Hawk

a less trendy way of using 'LOL' to represent laughing out loud when chatting online. You can use capital letters to represent harder laughter, and place them in any sequence depending on the type of laugh . 'ruFF' would be used if at first you just smiled, but then realized that what you read (or typed) was indeed, pretty funny.
Colin says: "My middle name is Susan."

Tim says: "rufF"

in this case, it wasn't terribly funny, but enough to get a smirk, then at the end, Tim realizes Colin is being especially silly and is forced to laugh.
by Canadian Night Hawk July 11, 2008
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