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According to some sites on the Internet there was a sixth season but it consisted of one lone episode but No, Ed Edd n Eddy ended production with the TV movie in 2009. There won't be a sixth 'full' season.
The mystery of Jimmy's retainer is explained in season 5 episode 1 (#53 titled "Every Which Way but Ed")
no
"An Ed is Born"
Ed, Edd n' Eddy - Volume 1: Edifying Ed-Ventures Ed, Edd n' Eddy - Volume 2: Fools' Par-Ed-Ise Ed, Edd n' Eddy - The Complete First Season Ed, Edd n' Eddy - The Complete Second Season Ed, Edd n' Eddy - The Complete Third Season Ed, Edd n' Eddy - The Complete Fourth Season Ed, Edd n' Eddy - The Complete Fifth Season Ed, Edd n' Eddy - The Complete Sixth Season (Senior DVD Release) Ed, Edd n' Eddy - Volume 3: Learning Ed-Venture Ed, Edd n' Eddy - Volume 4: School Ed-Vantage
They aired for Five full seasons, although according to the Internet, there was a "Sixth" season that consisted of One episode so clearly not a traditional season as TV shows go.
no
the Christmas special, boys will be boys, and the episode where they bet who can give up for one day what they love to do like Kevin likes to call eddy a dork.
"The Ed-Touchables"
All Ed Edd n Eddy seasons are available on itunes.
In epispde "Hot Buttered Ed", Edd can be found wearing floatie armbands as well as an intertube while swimming. It can be viewed in Season 2, Episode 12a which aired December 6th, 1999.
In an episode from season 2 named "Sailor Mouth", Spongebob and Patrick say the word f-ck and/or f--king