An individual who frequently strives to have a complete set of something, regardless of whether or not the individual pieces have any importance or value.
Boy: I've almost caught every single Pokémon!
Girl: Aren't there like 700 something now? You can't possibly raise them all.
Boy: Yeah, but I HAVE to catch them all!
Girl: Ugh, you're such a Completionist!
A person who feels It is a necessity to obtain or achieve everything despite its INSIGNIFICANT value. They feel the need to turn everything into a collection from Disney figurines to sexual encounters with peers.
Peer: I'll give you a twenty bag to suck my dicc out here in the hundred acre woods
Robbie: *Muffled gagging noises*
Pooh: Oh bother!
A person who feels It is a necessity to obtain or achieve everything despite its significant value. They feel the need to turn everything into a collection from sexual encounters with children to snuff films
Luke: Aidan why have you stolen all Zacs chromosomes he can't function without them
Aidan: I can't help it I'm a completionist
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.