I don't really think you can win on this one. You chose your username (and you can also change it as you have done before) This is the nicest reference I could find, wikipedia :
"Uncle Fester is a completely hairless, hunched, and barrel-shaped man with dark, sunken eyes and often a deranged smile."
There is an author called Uncle Fester who has written books about how to produce methamphetamine.
As mentioned, the urban dictionary has some even worse descriptions, some I have never heard of (and wish I didn't)....and ironically you were in fact the first person to pull out the Urban Dictionary for meanings of words so you reap what you sow unfortunately.
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