What's a noun/verb for whacking yourself on the head?
I vaguely recall having seen a word for this somewhere but I'm not that sure. The closest phrase I can think of is self harm or self mutilation, but those aren't really what I'm looking for.
I'd actually like something that can be used to convey someone's frustration, i.e. something like a facepalm.
It doesn't have to fit within the religious context.