Meaning Laughing my a** off
Type Acronym
Rank ★ ★ ★  Common
Usage Online Only (chat, messaging, e-mail)

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.

Example "LMAO, that is so funny."
Updated January 24, 2017
Information from PC.net