n. a extra seat on a motorcycle, behind the driver. (Refers either to the anatomy of the buttocks placed thereon, or to the genital anatomy of a female passenger. See also pussy-pad.) : Get on the crack-rack, and I'll give you a ride.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw-Hill Education.
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