What is "nutcases"

Usage examples of "nutcases".

Skimped on the food, took the bread out of the mouths of the poor nutcases and loony birds in there.

No such sanctimony came from the mouths of these psycho nutcases with green hair and nipple rings.

The nutcases at PETA would chain themselves to the gates of our military bases, protesting the fact that bombs hurt wildlife and their natural habitat.