What Does "P.S." Really Mean?

I was going through a friend's blog and came across this. Saw it many times before and could not contain my curiosity. So, I "googled" it and found quite many answers.

My Summary:

• "Post Script", commonly written as "P.S.", is to attach another sentence that you forgot earlier. This is commonly used in letters because we already wrote the letter in pen and can't edit it, leaving us no choice but to add our message after a "P.S.".

• "Post Post Script", or "P.P.S." is the note after a "P.S.". This can go on and we can have "P.P.P.S", "P.P.P.P.S.", and so on.

Lol, hope that I can upload more useful stuff like this next time...