Green’s Dictionary of Slang

dickhead n.

[dick n.1 (5) + -head sfx (1)]

1. a fool, an incompetent.

[US]C. Cooper Jr Farm (1968) 168: You’re such a God Damn Dickhead about the way you think life oughta be.
[Aus]D. Ireland Glass Canoe (1982) 16: I called him a dickhead, but he doesn’t know what he’s doing when he’s real full.
[UK]A. Sayle Train to Hell 80: Taking all that money off them dick-heads for performing that rubbish!
[Ire]J. O’Connor Secret World of the Irish Male (1995) 137: The man was clearly a drooling troglodyte [...] he really wanted to insult me, for some reason, this dribblingly delerious little Donegal dickhead.
[Aus]P. Temple Dead Point (2008) [ebook] Rioss rounded up [...] McCallum, a dickhead, and a lad called [...] Ionides, an even bigger dunce.
[NZ]P. Shannon Davey Darling 23: Though he was the Old Man’s best mate, I always had him figured for a bit of a dickhead.
[Aus]L. Redhead Cherry Pie [ebook] ‘All these idiots making stupid comedies about ocker dickheads’.
[US]Codella and Bennett Alphaville (2011) 315: I’ve seen good cops get set up by these IAB dickheads.
[Aus]L. Redhead Thrill City [ebook] Not the fucken house, you dickhead, the pen.
[Aus]T. Spicer Good Girl Stripped Bare 176: Dickheads who look down at their mobile phones while walking along the footpath.

2. attrib. use of sense 1.

[US]C. Goffard Snitch Jacket 94: My gut’s sending me the message you’re a dickhead, but [...] this ain’t a dickhead bar.

3. a general term of abuse.

[US]R. Moore Green Berets 238: ‘Who is that little dickhead?’ ‘That is my counterpart, the camp commander, Captain Nim.’.
[UK]D. Gram Foxes (1980) 43: Hey, dickhead?
[US]C. Stroud Close Pursuit (1988) 118: Got us a hymie cocksucker, ain’t we, dickhead?
[Aus]L. Davies Candy 80: Cocaine made dickheads into bigger, louder dickheads.
[Aus]T. Winton ‘Sand’ in Turning (2005) 167: A hole, dickhead.
[UK]Private Eye 7-20 Jan. 26/3: get ya finger out of bogbrush’s arse and fuck off back to england dickhead [lower case sic].

4. something problematic.

[US] in B. Jackson In the Life (1972) 165: But this bit here, man, aw, it’s a dickhead.
[US]R. Carter Sixteenth Round 319: The verdict was the dickhead that really seemed to blow Hogan’s mind the most.
[US](con. 1968) D.A. Dye Citadel (1989) 295: This Goddamn adrenalin high was a dickhead.