A Cock Blocker is someone who stops you from getting tang.
1. A boyfriend of the girl your getting with
2. someone interupting you, or embarrasing you
1. I was totally gonna get me some tang but she had to be dating Kyle. what a Cock Blocker
2. As i was about to unzip my pants and feed her my Vainey tree stick, this total Scott had to poop on me. cock blocked again for fucks sake.