Just wondering 0_0
P.S. stands for Post Script It is used when you wrote a message on a telegram or postcard and you forgot to mention an important information. The you write P.S. at the end of the message like here's an example.
Post Script Just means you want to say something else... example - What are you doing this weekend? P.S. the party will be at my place instead of ___'s.
post script :)