[quote=@Rilla]
You frown, Melon goes rage mode. xD

I'm more referring to hits that on the outside look no different. Like you've been taking normal jabs, for instance, with no IC knowledge that the character is preparing some magic to use with the jab. None at all, no energy sensing, no visual; then time for the energy to be applied, still no discernible sign(Say it just increases the power of the hit), and your character just instinctively knows.. "Hey, don't take that one, move out of the way." So instead of taking a jab that looks, for all intents and purposes, normal, you avoid it. 

Now, if it were obvious there was some preparation going on, like energy gathering in the hand(Thanks Fury), then yeah. Dodge that.

I also kinda look at metagaming as having two parts. The normal is 'yeah, the player knows it and transfer knowledge to character', and adding in stuff like you're replying to the person, not the character, especially after an argument/disagreement, and you sort of try and get the last word in via IC post. I'm sure we've all seen it before. Someone doesn't like what you did, so they throw in some snark in their IC
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Well, frankly, if I expect to launch an attack that could do insane damage I'd expect it to be noticeable. Unless your character is specifically set up to hide the nature of the power of xir's attacks, (which is incredibly rare, I don't think I've seen anyone use this sort of character before) then most of the time the super attack is very noticeable, like you said in Fury's case. Also, yes, the IC snark is real, I've tried to stop doing it completely because it just makes you look like an asshole. 

I think the ultimate form of meta-gaming is ranged projectiles though, you can have the least favourable conditions for shooting ever and still have a super accurate shot fired straight at you. It gets to the point where your character either has to be quick enough to dodge or they die, because nothing will stop your opponent and their unnerving accuracy. I once had my character charge while invisible through a cloud of debris and dust, and my opponent somehow spotted his footsteps and fired a shot straight at him, I just quit the fight after that, most hilarious case of meta gaming I'd ever seen. 

Poison and disease resistance is becoming more and more common, I think a lot of the time I just happen to be making characters that naturally would be resistant to disease and poison, but other times I suspect I am hemming it in unnecessarily to hedge my bets somewhat. It's ultimately because poison and disease is incredibly difficult to counter, other than natural immunities you're forced to avoid taking any cut or minor injury or risk being poisoned and killed, and some can even be transferred through a cloud or other near unavoidable miasma.