1. superlative form of miffed; most annoyed, irritated, or offended
Usage: informal; used to describe the highest degree of mild annoyance or displeasure

Examples

• She was the miffiest person in the room after being left out of the group chat.
• He looked miffiest when I forgot his birthday.
• Of all the team members, the captain seemed miffiest about the loss.
• My grandmother was miffiest when no one called her on Sunday.
• The miffiest customer demanded to speak to the manager immediately.
• I've never seen her miffiest before—she was really upset about the canceled plans.