Answers:
laughing my f*cking * of or laughing my * off.
laughing my * off
or just add another cuss word for the other phrase
See this previous post to EducationAsk.com
haha :D
LMFAO means "laughing my f*ing a** off"
LMAO means "laughing my a** off"
both basically mean "I am laughing really hard"
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