1. A generic term pertaining to several widespread, unrelated families of passerine birds- Old World Flycatchers, Paradise Flycatchers, and Tyrant Flycatchers being just a few examples.
2. A person who attracts public attention by loudly announcing that your fly is open.
Person: (Pointing to a bird) Hey! What's that over there?
Birdwatcher: Hmmm...it looks like some sort of flycatcher...
"My girlfriend told me to zip up my fly while we were at a fancy restaurant yesterday."
"Gee, what a flycatcher!"