What does this mean?

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What does this mean when people use this in post LAMFAO

 

[FOTIS]

LAUGH MY F......ING ASS OFF

 

[bullet]

OH!!! I don't think I will be using that, thanks POP

 

[CZ]

Everyday I learn something new :lol: :lol: gud english,hihi

 

[FOTIS]

ROTFLAMFAO

Rolling on the floor laughing my f....ng arse off

 

[Big Squeeze]

:lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol:

 

[Greg Nolan]

It sounds like a one time deal. Considering how life goes I'm going to have to regenerate several time to get thrue it :lol: :lol: