on various message boards you can PM or "Private Message" someone

1. a personal or private message

2. to send someone a personal or private message on a message board, forum or chat room

Short for prime minister (Teresa May) this word describes someone who royally messes up all the time and no one likes them.

A Prostate Massage

A ruthless gang who patrol the South of England jumping various other, more minor gangs. It is believed that the PM originally consisted of only five founding members, and have grown to be feared ever since.

Short for Product Manager, teams of employees developing a product are headed by a Product Manager.

Used in Google's business model