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1.
Methods used in mathematical proofs/derivations that was seemingly pulled out of one's ass, justified by use of "clairvoyance."

Often found in work in theoretical physics.
Student A: "Hey, how would you expand Riemann-Zeta(1+epsilon) while epsilon approaches 0?"
Student B: "Oh, dude...that's some serious gypsy shit with the Euler-Mascheroni."
by JLyricist March 22, 2010