1. That look that your girlfriend's dad gives you when you meet him for the first time; esp. effective when used looking over the shoulder of your girlfriend as she hugs him.
2. A cockblocking stare.
At fist I was excited to meet Kelly's family for the first time, and they all seemed nice, but as soon as her dad gave me the topplehi over her shoulder, I knew that the next two hours would be rough. What a cockbocking son of a bitch.