The area inside of the center of social interaction, commonly where people meet each other, exchange information, and generally have a good time; The opposite of the Periphery
Dude did you see Dave talking to all those girls last night, he was totally in the proximity.
A person that succesfully busts another guy's game and takes his girl home.
I was all up on this chick last night and then this clown from my psych class came in and played spoiler and went home with her.
An area commonly in a bar or night club that is outside of the center of social interaction.
We were hitting on all these chicks and having a great time, David was just slowing us down because he was all up in the periphery.