What's "Grinch" here?
Native speaker’s answer
Rebecca
"Grinch" is a term used to describe people who are mean, unfriendly, and like to ruin the happiness of others. In popular culture, it usually refers to the "Grinch of Christmas," a grouchy, green-colored creature that likes to make people unhappy. It's sometimes worn as a Halloween or Christmas costume. Ex: Don't be such a grinch! Be happy for others. Ex: He's such a grinch, he hates seeing other people smile.