The glans penis.
...down, down, sinking down faster than she's so far moved, the dick head exploding up into all that wet, warm slime...
A jerk; a mean or rude person.
I don't want them Special Forces guys left out there when some dickhead is afraid to go get them.
A stupid or useless person.
"Watch it, dickhead!" "Hey, Stan, that's my shirt you just dropped in the snow!"
From dick + head. Attested since the 1960s, with the jerk sense appearing earliest. Compare cockhead, knobhead.
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