when playing beer pong, there is always left overs(backwash) in the cups needed to play the next game. The friends cup is a place to pour all the backwash, or "friends".
by sailboats September 08, 2007
A person you meet at an event or bar who is cool to hang out with at the time but you never talk to or hang out with again. A throw away friend.
by tocathe1 May 25, 2014