A girl who when giving a hug rams or pushes her crotch against the other person. Perhaps an indication that she is attracted to the person she cooch pushes, or maybe she's just a slut :)
"Vanessa totally wants me, dude! Everytime we hug she gives the old cooch push!"
"Everyone knows she's a cooch pusher, bro!"
To set it is to walk into a bar or party and "own" the place. To be the life of the party. To be the person everyone wants to chat up, buy a drink, or hook up with.
"I totally set it at The Loop last night!"
"We are going to go out tonight and set it!!"