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1.
Used to express indifference when confronted with something very expensive.

Comes from the restaurant scene in American Psycho: "And speaking
of reasonable...(He shows McDermott the bill for the meal) only $470!"
-Coming out this evening?

-I can't...I had a seriously reasonable night yesterday.

-How much did you drop?

-About a grand.

-Reasonable!

-Indeed.
by Moistyn Toyler January 28, 2008