1. A term used when someone says something that is too bleak or depressing for that particular situation. It's generally used in a way that implies that person should tone it down, but in a way that isn't as harsh.

2. A term of endearment for a black dog. This is a reference to the grims from Harry Potter, which are mythical black dogs said to be omens of death. Calling your dog a little grim is similar to calling your black cat a familiar in that it is poking fun at the popular image of the animals.
1. Person A: "Dude, those ropes would be pretty good to hang yourself with!"

Person B: "That's a little grim, dude. This is a pirate ship ride. There are children here."

2. "Here's a picture of my little grim! He's a black lab."
by Dr. Sigh September 9, 2016
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