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A joke/insult or statement that makes little or no sense to the current conversation, often completely out of context and can leave the listener confused or perplexed but usually in fits of laughter..
Person: "Deeks why are you always in the library.."
Deeks: "Sure maaaaaate i'll be there in 5 mins..."
Person: "What?"
Deeks: "haha..."
Person: "classic deekism"
by joshikins July 04, 2009
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