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Appending 'Schmain' to 'Pain' indicates complete nonchalance on the behalf of the utterer with regard to the promised, expected or forthcoming pain.

The idea being expressed is that Pain will affect him no more than Schmain would. There is no such thing as Schmain.
Macduff: You are entering a world of pain, boy.
Macbeth: Pain Schmain.
by redwind64 February 11, 2005
The jewish way of saying "hurting"
Mostletoff!! Fuck that Pain schmain
by Jonny December 28, 2004