jackwagon

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jackwagon (plural jackwagons)

1. (US, slang, derogatory) An objectionable person; a jerk; a jackass.
   • 2010, Geico Drill Sergeant Therapist‎^[1] (commercial):

     Maybe we should chug on over to mamby-pamby land where maybe we can find some self confidence for you, you jackwagon!