To shove someone's head by placing an open palm on the person's face and pushing. Similar to a slap, but without the speed and with the force directed forward rather than sideways; typically used to escalate a verbal argument just before coming to blows. It's the most offensive thing you can do to a person without causing them pain.

v. collectively or individually finding someone/something to blame for a problem, as opposed to brainstorming which connotes finding solutions to a problem

n. the act of finding someone/something to blame for a problem

(from a TV ad for HD television)