CSL
CSL definition by Slang.net
This page explains what the acronym "CSL" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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Someone who sends you CSL "can't stop laughing," likely as a result of a joke or other humorous message you sent them. So congrats - you've set this person LOLing, and no matter how hard they try, they just can't stop.
People use CSL less commonly than LOL, ROFL, ROFLMAO, and several other laughter-oriented acronyms. Thus, you know the person who sent you CSL is really, sincerely, laughing (and will likely continue doing so for awhile).