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When the fucking is so good that your partner moans like an animal so humorously that you need to take a break to assess which animal they are.
Guy 1: dude my girlfriend was being really freaky last night with that animal humor, she sounded like a horse for a while!!
When a couple pretends to be animals during sex, including the noises made and the positions usually used by animals during intercourse. Usually involves watching animal porn as well
Guy 1: Hey! Me and my girlfriend just had some amazing sex!
Guy 2: oh please tell me you didn't do animal humor again.
Guy 1: ummm.... maybe...