A derogatory name for someone of Middle-Eastern descent. Probably the most common usage is in reference to Selami bin Hiden, I mean Osama bin Laden. Especially given the circumstances in Iraq, a diaper head is not a good thing to be.
a childish person who smells. usually of penis. a childish nickname for childish acting adolescents. usually a diaper head has a microsaphallic brother with rotten teeth.