When a guy isn't your boyfriend, but he isn't exactly a friend either. He's somewhere in between. He may eventually be your man or he's someone that you're fooling around with. Some may also use the term to refer to their celebrity man crush.
What stupid high school boys in London call themselves, they are under the assumption that they are full grown men and that they actually mean something to the world. When in reality they suck arse.
See vikas pussy boy: nuff mans want to cut that boi
arse kisser: yeah if you start a fight i will jump in and hold him down
pussy boy: im gonna fuck him up
Generally refers to a friend, buddy, or someone you hang around with, but is also used to refer to one's penis. The latter usage is common in the Northeastern part of the United States.