Painting Out the Door

I had this dream last night. I was sitting with an older man, and we were at work, having a general conversation about work and ourselves in relation to it. He was a new employee, while I had been working there for a while.

I made this observation that I often had an impulse to throw something, and that several times a week I had to restrain myself. He said something along the lines of, "I often wonder if I'm painting out the door just so I can pay for my internet connection."

I got out of bed just so I could Google that phrase. I feel like 'painting out the door' has something to do with art, but I found nothing. Where did I get that? What could it mean? I'll have to make something up.