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English word dickwad comes from English dick, English -wad
dick (English)
(obsolete) A declaration. (uncommon, US, slang) A detective. (slang, vulgar) To mistreat or take advantage of somebody (with around).. (slang, vulgar) To waste time, to goof off (with around).. (slang, vulgar, of a man) To have sexual intercourse with. (countable, British, US, vulgar, slang, pejorative) A highly contemptible person.. (countable, and, uncountable, vulgar, slang) The penis.. [...]
-wad (English)
Added to a variety of vulgar term and insults for an obnoxious person to create new insults.
dickwad (English)
(vulgar, slang) A contemptible person; a fool.