A work jacket or flannel that has been well worn and thoroughly beat up.
Man #1 : Why doesn't Chris get a new Carhartt? The one he has is old and dirty.
Man #2 : What, you don't like his Canadian Dinner Jacket?
v. To masturbate to other motorists while driving.
Woman #1: What was that driver staring at?
Woman #2: I think he was pulling a dirty trucker.
Woman #1: What's that?
Woman #2: It's when you masturbate while driving.