Pontiac Poser
When you're approaching a vehicle that looks very nice and expensive, but when you get close enough to it, you realize oh, it's just a Pontiac.
"Dude, look at that nice as car!"
*drives past car*
"Psh, that's not a nice car, that guy is a Pontiac Poser!
*drives past car*
"Psh, that's not a nice car, that guy is a Pontiac Poser!