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English word jerkwad comes from English jerk, English -wad
jerk (English)
(Caribbean) A rich, spicy Jamaican marinade. (Caribbean) Meat cured by jerking; charqui. (US, slang, pejorative) A dull or stupid person.. (US, slang, pejorative) A person with unlikable or obnoxious qualities and behavior, typically mean, self-centered, or disagreeable.. (obsolete) A soda jerk.. (physics, engineering) The rate of change in acceleration with respect to time.. (weightlifting) [...]
-wad (English)
Added to a variety of vulgar term and insults for an obnoxious person to create new insults.
jerkwad (English)
(slang, derogatory, North America) A jerk; an obnoxious person.