Definitions

1. superlative of adjective

most given to making a great show or fuss, or pretending to be upset or offended.

“She was being her usual muzziest, acting like the whole thing was a personal attack.”

2. noun

a person who makes a great show or fuss, or pretends to be upset or offended.

“After her outburst, everyone knew she was the muzziest in the office.”