To miff someone means to annoy or offend them slightly, usually about something small. If you forget to save a seat for your friend at lunch, you might miff them a little. When your sister borrows your favorite pen without asking, it could miff you, even though it's not a huge problem.

The word suggests mild irritation rather than serious anger. You wouldn't say someone was miffed about a major betrayal; instead, they're miffed about minor slights or petty annoyances. A teacher might be miffed when students talk during instructions. A parent might feel miffed when nobody notices they cleaned the whole house.

When someone is miffed, they're in a huffy, slightly wounded mood. They might cross their arms, speak curtly, or need a few minutes to get over it. The feeling usually passes quickly once the person cools down or receives an apology. Being miffed is somewhere between genuinely unbothered and actually angry: annoyed enough to show it, but not angry enough to stay that way for long.