LMAO definition by Slang.net
This page explains what the acronym "LMAO" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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LMAO means laughing my a** off. It is a common acronym used when something is especially funny. The acronym often appears in texts and online chat rooms.
The "laughing my a** off" phrase is similar to many other hyperbolic sayings where people do something so extreme that a part of their body falls off, whether it be a head, arm, or leg. Some examples of these sayings include "laughing my head off" and "writing my arm off." LMAO is also part of several more elaborate acronyms, including LMFAO and ROFLMAO.