In musical theatre, regardless of the subject matter of a show, a song is written for a black woman to sing (or more commonly, belt) that is supposed to be a showstopper. Named after famed film and theatrical composer Marc Shaiman
Ben: That black woman's random song in the second act really stopped the show in a good way.

Charles: It was smart of the composers to employ the Marc Shaiman rule.
by theaterqueen November 24, 2011
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A rule where everybody chugs their first alcoholic beverage of the night.
Cheers guys! WAIT, you have to chug it! Marc’s rule!
by Bigdaddlongpipe July 13, 2018
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