stands for peace in the middle east
a) because that would be a good thing and
b) it's too long to always type out.
This is a form of signing off of an IM or suh device.
"Sometimes memories of the movie(s) pop back in my mind. I thought i had stuffed those memories far far away to protect my brain from the absolute shock and trauma."
PTTMSD examples:
Transformers by director Michael Bay Transformers: Revenge of the Fallen Transformers: Dark of the Moon