DICKHEAD
asshole, bastard, cocksucker, dickhead, shit, mother fucker, motherfucker, prick, whoreson, son of a bitch, SOB
(noun) insulting terms of address for people who are stupid or irritating or ridiculous
Source: WordNet® 3.1
Etymology
Noun
dickhead (plural dickheads)
(vulgar, colloquial, pejorative) A jerk; a mean or rude person.
(vulgar, colloquial) The glans penis.
(vulgar, colloquial, pejorative) A stupid or useless person.
Synonyms
• (glans penis): see also glans.
• (jerk): see also jerk.
• (idiot): see also fool or idiot.
Source: Wiktionary