rockhead

noun4

1. •
   (slang, disapproving) A stupid person.

   • Men seemed just as superfluous as women, a bunch of rockheads running around punching each other and getting hot and sweaty about guns. — 2016
2. •
   (slang) A fan of rock music.

   • […] an apparent betrayal of electronica's more oblique, less suburban ethos in favor of a record the rockheads like. — 1997
3. •
   The surface of the bedrock beneath soil cover.

   • This type of area, with reasonably well-defined rockheads under glacial and lacustrine deposits, probably represents optimum conditions for the adoption of seismic exploration techniques. — 2012
4. •
   The fish Bothragonus swanii, a variety of poacher.