Definder - what does the word mean?

What is Laughing My Fucking Ass Off?

Longer Version of LMFAO. Basically for twats who cant express proper emotion or use grammar, also a shitty band who produce utter crap typical of this time period

LMFAO's Party rock was such a great song, Laughing my fucking ass off

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Laughing My Fucking Ass Off - video