Imagine my surprise on hearing this on Adventure Time! (Series 7 episode 'Preboot') This isn't a zoo, zoo nerd.
It sounds like quite a random thing to say. What makes Finn (I presume she is talking to him) a zoo nerd lol?
They were in a spaceship (which tunnelled underground in the shape of a narwhal) with a display of creatures genetically created by the owner of the ship.