What is You're A?
A surefire method to make a joke out of nothing, by taking the last thing someone says to you and prefacing it with "you're a". Best if done repeatedly amongst like-minded folk over a long, long, long period of time.
"I'm going out tonight, but it's just a work thing."
"You're a work thing."
"That guy who comes coming into my cubicle is barking mad."
"You're a barking mad."