Turtle (v.) - to curl up and cover your head in an attempt to avoid being pummeled by another player.
It's hard for me to blame a guy for trying to protect his face and head from some other big, strong hockey player, especially if the person doing the pummeling is quite a bit bigger. I would do the same thing. However, I have felt embarrassment when I caught a guy on our team turtling. I was like, really, dude? Really?