A Kauka is a person who has a penis that is not long, but that is thin. Such people will also make frequent bad jokes regarding doctors.
Girl 1: Did you screw that guy?
Girl 2: Yeah, but it was bad. He was a total Kauka.
Kauka: Wow, it takes ages to get served here huh?
Girl: You gotta have patience dude.
Kauka: Doctors have patients, I don't.