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mack1

[mak]Slang.
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noun
  1. a pimp.
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verb (used without object)
  1. to flirt with or make sexual advances toward someone (often followed by on): They spend their nights macking on the ladies.
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Origin of mack1

1885–90; by shortening of mackerel pimp < Middle French; see mackerel
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for mack on

mack1

noun
  1. British informal a variant spelling of mac short for mackintosh (def. 1), mackintosh (def. 3)
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mack2

noun
  1. slang a pimp
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Word Origin

C19: shortened from obsolete mackerel, from Old French, of uncertain origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for mack on

Mack

proprietary name for a brand of heavy automobile trucks, named for brothers John M., Augustus F., and William C. Mack, who established Mack Brothers Company, N.Y., N.Y., in 1902. Their trucks formally known as "Mack Trucks" from 1910.

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Online Etymology Dictionary, © 2010 Douglas Harper