conversation kill

A phrase or word, usually during texts or IM like "oh Haha" or "hm" that offers nothing and is hard to follow
sometimes out of disinterest, or wanting to other person to shut up

Guy 1: man that movie was awesome
Guy 2: hm
Guy 1: great conversation kill, asshole

Conversational Kills

A word or sentence that instantly kills any conversation.

John: "Oh hi! How are the kids?"
Susan: "I ate them."

Carl: "Have you seen Susan lately?"
John: "No, her conversational kills freak me out."