When you are interested in someone or perphaps even dating them and all of a sudden they give your number to one of their freinds. This is the ultimate slap in the face. It's like saying "hey I tried he/she out and didn't like them, but maybe you should try it out or atleast take one for the team.
I can't believe he gave me the hand off. What a tool bag! he could atleast hand me off to someone hot.