What does "dummy up" mean here?
The cops wouldn't tell me who the owner was, but we're a military town, so I took a chance. Called my insurance (USAA) and as luck would have it, that was the other guy's insurance too!...Got my mechanic to dummy up a $50 statement, just to submit it to USAA and have it on the douche's record. That's what he gets for being a lying asshole.