When cats, mainly related or at least of the same household, wrestle and roll around on the floor. In a somewhat violent manner. Resembles a rodeo event, but for cats.
Could also be two cute, young girls scrapping it out, maybe on the school yard or on the dance floor of some "trendy" nightclub where too many Ed Hardy wearing "doods" and douche-bags whip the young nubiles into a Jager-induced frenzy.
Dog person: Look! Your cats are tearing each other up!
Cat person: Relax, it's just a bit of kitty rodeo. Probably just a full moon out.
Ed Hardy wearing moron A: Bra'! Look at those pop-tarts go at it on the floor! Looks like a Kitten Rodeo!
Ed Hardy wearing moron B: Yeah! It's great! I can see that one girrrls snatch, she isn't wearing panties!
EHWM A: Tru dat!