The full form of LMFAO is laughing my fuck ass off.

It is an expression that is often used online and in text. The literal meaning is, “laughing my fu**** ass off.” In British English, some people say “arse” instead of ass. It can be used in a variety of situations.

The definition itself is quite comical. It means that someone laughed so hard that their rear-end fell off!

Similar Internet Slang Words

Similar expressions include “LMAO” or “laughing my ass off.” This is almost the same as “lol” or “laughing out loud.” “LMFAO” shows the highest degree of reaction to something that is considered funny or comical.

Because this expression includes the word “fu**,” it should not be used in professional situations. Some people may take offense to this word so it’s best to use it with friends.

This expression can be used in text messages, on social media, or at work between colleagues. It should not be used with clients or supervisors.

Conversation Examples
Here are some examples:

Example 1

Co-worker 1: Holy crap! Did you see the prank Suzy pulled on Dave? It was hilarious!
Co-worker 2: Yeah man, I was super LMFAO.