noun. A dumber version of an asshead, or an assier version of a dumbhead, or a headier version of a dumbass.
Related terms: asshead, fatasshead, jackasshead.
Real citation: "I'm one of the people (actually, I'm several of them, but let's not get into biohosting issues just now), and I didn't drive no areoplanes inta the squirrel training center. you dumbasshead!"
(ICEKNIFE, July 8, 2003, http://groups-beta.google.com/group/alt.slack/msg/f6f7bc39aa973278?hl=en)
Made-up citation: "Son, if someone calls you a 'dumbasshead,' don't be afraid to call them an 'assbuttface.' Then, when no teachers are around, gouge out that little prick's eyeballs with a fork."