1. A type of pokémon, resembling a sheep.
2. A term used to describe somebody who started playing Pokémon Go without having played any of the games prior.
"Heh. Ben plays Pokémon Go. He probably doesn't even know what a fucking insert pokémon/pokémon-themed thing here. What a Mareep
october 14th is mareep day where you post a gif of mareep to your friends and when they question you say "Ok".
Friend: hey its mareep day
You: Ok