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deduplication 

This is a new computer scheme to reduce data.
Deduplication is the process of removing duplicate data, but remembering where it is. This way, multiple copies are usable, but take up the space of only one.
Damn dawg, my tape backup size is going crazy, I'm thinking about setting up some deduplication in this bitch to reduce backup and restore times for the man!
deduplication by Loc Dog187 November 18, 2009
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reduplication

A linguistic term for repeating a word twice. Generally emphasizes the duplicated word, but American slang uses it to indicate that the word is being used in its truest or most specialized sense.
"Your cousin kissed you? You mean, like a _kiss_ kiss?"

"Was it a _date_ date or just a date?"
reduplication by timecube June 16, 2004

Social duplication. 

Social duplication is when you talk to someone frequently enough that you start using the same terms and mannerisms as them. Usually spotted in close friends and intimate relationships, both or either of the parties in frequent contact take words and phrases, among other forms of communication and apply it in their conversations. Often, this can have a chain effect, having the people that they talk to also display the passed on mannerisms.
Person 1: Hey, Phill's been talking to John a lot lately and he's starting to talk a lot like him.

Person 2: Must be social duplication.

derplication 

When someone does the very same ignorant action or comment that some other dumbass just made.
Person 1. *burns hand* "owwww"
Person 2. "haha you burned yourself". *burns hand the same way* "owwww"
Person 3. "congratulations! person 2, you just did a successful derplication of person 1."
derplication by cardinal91 December 11, 2013

penis duplication glitch

when you chop off all of your friends and family's penis's and attach it to your original penis making unlimited penis's on your penis but you have to take their balls to making a ball of balls and dicks.
"yo dad I found penis duplaction glitch wanna try it out"

he used the penis duplication glitch on me and now he is disowned