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1.
An onomatopeaia. The sound of a small zap when power cables inside a computer touch the case when the computer is turned on producing sparks and or even a short circuited power supply. So widely used now that it is even used to describe meanings outside of computing.
OH noes. I accidentally Tsooked my computer yesterday now it won't boot up!

*outside of computing* If you don't give me your GTX260 I'm going to Tsook you!
by Sheng Da Flash Pro March 16, 2009