jetta theory Share definition Flag The theory that states there's a 8 out of ten chance that the driver of a vw jetta is a hot female I got up to the light to find a smokin hot chick driving. Proving the jetta theory. jetta theory by Red Rockafella December 11, 2013 0 0 Get merch Get the jetta theory mug. Buy Now — $32.95 See more merch