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A phrase used to describe an extremely difficult task or how hard an object is. The inference is that calculus is difficult by itself and in Chinese, a seemly nonsense language compared to English, it is extremely hard. Etymology: Midwest slang.
That girl is so hot, she makes my dick harder than Chinese calculus.

My grandpa said "trying to program my VCR is harder than Chinese calculus."
by Chris4444 January 08, 2012