A Kombi is short for Kombination (e.g. Kombiwagen) and either refers to a so called station wagon or some other utility wagon (not a 'ute' i.e. a pickup, but could certainly be a bussy affair)
Strangely enough Germans call anything with a standard sedan format a limousine, even if it's just a normal car.

While we're the subject can anyone explain what makes a coupé a coupé? Is it the 2/3 doors, the motor size or the price?

Ach, nebenbei bemerkt, Ich fand Mark Twains Schreibereien nicht sehr ermutigend!