referring to a person who is incredibly stupid and probably either arrogant and/or obnoxious. An idiot, an arrogant moron.
Metaphor for idiocy with the literal meaning of someone who's brain has been eaten up or ate up.
Stupid or brazenly idiotic behavior or personality
Rush Limbaugh is such an ate-up... I can't believe the ate-up thing he said in 1994: "It has not been proven that nicotine is addictive, the same with cigarettes causing emphysema and other diseases." (Radio show, 4/29/94)