Jewtsu is the purposed misspelling of the term Jutsu.

A stereotypical view on people who study Judaism states Jewish people have a higher intelligence level to other people in the society, and therefore when they portray clever theories or create clever contraptions, it is said jokefully that they are using a Jewstu or Jew Jutsu.
Jewish man: I just figured out the 2,547th denominator of a quadratic when pie is replacing the 4th and 5th indecy!
Other man: Christ that is some Jew Jewtsu you got there!
by WhatsherfaceBBQ July 14, 2009
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