Edmunds (the car buyer information company) sent a reporter undercover to work as a car salesman and report back on the tricks of the trade. It's a great read, and there's a dealer jargon glossary at the end of the piece.
Pounder – A deal with $1,000 profit in it. "Doctor comes in and buys the top of the line model, fully loaded – and he pays sticker! That'll be a two pounder for me."
Rip their heads off – This describes taking a customer to the cleaners. "I stole their trade in, I sold them the car at a grand over sticker – I mean, I just ripped their heads off."
Roach – A customer with bad credit. Not to be confused with the "roach coach" (see entry below). "The guy looked good. But we ran his credit and he turned out to be a roach. We're talkin' a 400 credit score here."
Link (Thanks, Scott!)
