That bald old-ass guy from "The Addams Family."
"The Addams Family started,
When Uncle Fester farted,
They all became retarded,
The Addams Family!"
by Jason L. March 3, 2005
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An irritating roommate that constantly makes life difficult.
I got home today and found out that my roomate Will pulled An Uncle Fester, he cancelled our Internet service without warning because he has a gambling addiction.

Uncle Fester is at it again, he took all my laundry out of the dryer and through on the top of the dryer because he has to do his laundry at the same time I do mine.
by Glowspank December 20, 2016
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The great old one. He who must not be summoned. The ancient. The unholy. Defined by mass alone, this great one will consume any and all within it's path. Fueled by pure alcohol and driven only to feed.
"Here comes Uncle Fester, hide the snacks."
by RubartPaulson February 19, 2008
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Uncle Fester - Child Molestor

Not originally used by the gentry of old east London town, now officially part of the Cockney rhyming dictionary and appearing on various 'Cockney' translation sites, ''Uncle Fester'' has become the new ''Nonce'' or ''Kiddie Fiddler.''

Apparently movies such as Lock, Stock and Two Smoking Barrels - full of faux Cockney wording - encouraged people to take up creating their own rhyming slang.

''Uncle Fester'' has been affectionately adopted and accepted as a more modern alternative to ''nonce'' in many areas of East and South London.
1. ''Did you 'ear about ol' Keith? Yeah...turns out the filthy git's an Uncle Fester, 'e's been done for feelin' up some schoolie.''

2.Some celebrity Uncle Festers include; Gary Glitter. Pete Townshend, Matthew Kelly, R. Kelly, Kanye West and Elton John.
by A. Jackson October 16, 2007
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A person who uses a modified lightbulb to smoke Meth.
Uncle R*** is bein a Uncle fester again huh? stickin lightbulbs in his mouth makin um light up.
by lil white boi from bama January 2, 2010
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Someone who can't screw in a light bulb. Uncle Fester only knows how to screw herself.... she just sits and festers!
You think we are gonna answer your e-mail...well you can just go Uncle Fester!!!
by bobapple October 14, 2005
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