if someone says 'cleantec' to you when you are trying to prove something and you say it back to them and then you find out it is not true and can prove it. you get to hit the other person across the head with a text book
(original book used yr10 A or B math Text book)
(originated rockhampton grammar school 2010 by seniors 2012).
Jackson: i made the australian football team
Mike: Cleantec?
Jackson: Cleantec!
(Mike finds out it is not true and therefore gets to hit Jackson across the face with a student text book)
by MaD-xC January 19, 2011

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