The Hofmeister kink is an automobile design feature seen on modern BMWs and automobiles by other manufacturers […] which consists of a low forward bend at the C-pillar or D-pillar in the case of touring vehicles or SUV’s.
The kink first appeared on the BMW 3200 CS and the BMW 1500 at the Frankfurt Motor Show in September 1961 and was later named after then-BMW director of design, Wilhelm Hofmeister. Apart from its stylistic effect, the Hofmeister kink is said by BMW to suggest that all BMW models have rear-wheel drive (or all-wheel drive biased to the rear).
Once you know about it, you can’t stop seeing it (especially on BMWs). The picture above is from New Media Campaigns, where there is also more information about the kink.