Best definition
whoah! cheetah porno!
something you say when:
1, you see cheetahs mating.
2, you see people fucking fast.
3, you see people fucking cheetah style.

safari tourist1: hey look those cheetahs are mating!

safari tourist2: whoah! cheetah porno!

jacob: uh… i think the people are fucking on the subway…

joshua: whoah! cheetah porno!

jenna: time to watch porno..

jenna whoa! cheetah porno!