The sound effect used to delineate that someone has just said something utterly stupid. Derived from the sound an answering machine makes, thus indicating nobody is home.
Person 1: Hey, what country is China in?
Person 2: Boop!
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From the word 'dissident' and the corporation 'Disney', this term denotes a person who is involved in a boycott of Disney and all Disney affiliates. Much like a vegetarian, this person will probably believe themselves to be morally superior, and try to force their beliefs on you whenever possible.
Tom: HEY! I just got this awesome new DVD of Wolverine! Want to come over and watch it on my massive tv and pretend like we're X-men?
Paul: No dude, I'm a Disnedent. Marvel are owned by Disney now after the August 2009 buyout. I'd prefer it if you provided some ethically-sound entertainment, actually.
Tom: .....oh.