look up any word, like sex:
 
1.
noun.
1. A trollfly is that annoying fly that seems to buzz only around your head, and nobody else's. Especially annoyig when one is in a group of people and the trollfly refuses to leave.

2. The fly that is buzzing around in one's vehicle.
Jon: *waves his hands trying to get the trollfly*
Steve: Dude what are you doing?
Jon: Its this damn trollfly!
by CharlieDeltaMike9150 November 14, 2011