I mean Last Action...what the heck is that?

And how did that guy at GC get hit when it was on his turn (as per above)?

Um, yeah, let me be the first to say, huh? What above are you "as per"ing?

Huh?
To the question of what "Last Action" means, I refer you to the comprehensive tournament rules:
As to the second question, I have no idea what you're even asking about.

Yeah, sorry I'm at work so I'm distracted and I wasnt making sense...

...anyways, I saw the thread where the guy mentioned at Gencon he was hit on his own turn... guess its a rib, but just wanted to check.

I haven't seen that, so I don't know what that's about. I can't imagine anyone was brave enough to play Wrecker at GenCon...

There are a number of ways that could happen. Energy Explosion (and targeting an opponent adjacent to one of your figures) is the most common. Big Figure can also cause you to get hit on your own turn.