Being excessivly hard on yourself for mistakes made and/or opportunities missed.

Openly admitting being wrong at the expsense of dignity or self image.

When a guy is getting head.

Piercings in ones face. Usually chunks of metal sticking out of unexpected locations.

In the video game Team Fortress 2, the Spy class is able to instantly kill players from behind with his knife. But sadly, TF2's unreliable hit registration means the Spy sometimes instantly kills from the front.