Top Definition
An abbreviated form for the phrase, “Laughing My Fucking Nipples Off.” Its purpose is to create a more expressive illustration of great laughter or amusement, similar to LMFAO (which means, "Laughing My Fucking Ass Off.") The term is commonly used on the Internet, online and conversations across gaming/chat rooms or texting.
Girl: Do you believe in puppy love?
Boy: I tried it once, but their assholes are too small.
Girl: LMFNO!
by samcaba January 10, 2011

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Laughing My Fucking Nuts Off
I was LMFNO when i heard that Palin is running for president.

LOLLMAOLMFAOLMNOHaHa
by georgeyea June 16, 2011

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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Acronym: Laughing my fat nuts off.

May be used as a substitute for other similar acronyms such as lmao, lol, ect.
Person 1: Yeah, and then he STEPPED in it!!

Person 2: LMFNO!
by Dritto December 14, 2004

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt