Centaur mythology revolves around half-horse / half-human creatures whose origin is little understood.
I'll be blunt, in ancient Greek mythology centaurs are basically frat boys with horse bodies. I'm talking the body of a horse up to its neck, then the torso, head, and arms of a total asshole human being.
In general they were wild and rude, loud and unruly, and generally just liked to run around the countryside getting drunk and being jerks.