It is an acronym for 'Laughing My Fat Ass Off' which is generally used in chat and internet conversations to indicate something very funny.
|Laughing My Fat Ass Off||Internet Chat||LMFAO|
|Laughing my fu*king ass off||Internet Slang||LMFAO|
|Laugh My Freaking Ass Off||Messaging||LMFAO|
|Laughing My F***ing Ass Off||Messaging||LMFAO|
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