A person of extreme (nutty) beliefs. A zealot who wishes to force others to accept their fringe belief system. Usually reserved for persons of right wing (conservative) persuasion. A nutball is so sure they are right, they may do physical harm to anyone who disagrees with them.
"That nutball is trying to get evolution out of our school." Some common nutball types are: bomb-packing terrorists, christian evangelists, creationists, way-right republicans, war-mongers, hate-mongers, white supremacists, nazis, extremests.
by pix pix June 02, 2007