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A term in retail sales to describe a customer who is bothersome, annoying, or time consuming.
Check out Dave, he's got a fester.

That guy festered me up for two hours and I only made twenty bucks on the sale!
fester by D317 September 19, 2006
One of the most disgusting yet disturbingly erotic stories you'll ever read on the internet. You can usually find it on pastebin.ca or 4chan's /b/, rarely though.
Guy 1: Hey man, did you read that story online called "Fester"?

Guy 2: Yeah, that shit was disgusting! I got a boner, though.

Guy 1: You sick fuck!
Fester by -Ninja_Jesus- July 12, 2009
1. A name givin to a Kid whos mom is Known for Molesting Little kids in a hot Tub.
2. Fes..Fes..Fes..FestorIouS
Fester U Faggot! Go molest sumting!
Fester by Daddy March 4, 2003
Brittish Slang term for a european Ford Fiesta.
Awesome big bore pipe on that Fester.
Fester by Nick December 6, 2004
multiuse-
n: a guy who gets in the way of his friend's game, see also - cockblock

v: to be annoying, irritating
A guy likes a girl, his friend comes up and starts calling him out. The guy is like 'Stop being such a fester!'
fester by katieishere May 9, 2005
A person or a group (Festers) of people attending Coachella festival. Now referred to as Coachella.
Festers have landed in Indio, ready to brave the sand and party to the music!
Fester by BabyKan June 9, 2016