What does lmfao mean?

What does LMFAO mean? What does IAMFO mean? I keep hearing these terms on this site but I have no idea what they mean, and nobody tells me. Please give suggestions. Thank You.

LMFAO means Laughing my f***ing a** off. I don't know what the second one means.

what the person ^ said
But I think the two word mean the same thing!!!

lAMFO is the same thing, the person just forgot to capitalize the L.

What does LMFAO mean?
Laughing my F***ing @$$ off.

What does IAMFO mean?

Laughing @$$ my f***ing off.

Is this a ploy to have people swear on here bbb? You wuold think someone who spends as much time on a computer as you do would have figured those out by now.

Theres:

lol - laughing out loud
rofl - rolling on the floor laughing
lmao - laughing my arse off
lmfao - laughing my f*cking arse off

and many more :D

Thanks for the answer but don't forget about NNFTA (Nother Night F*cking That A*s!)

laughn my a*s off