Well, what is OOC and IC exactly?
The answer is simple.
OOC simply stands for Out Of Character
IC simply stands for In Character (Sometimes seen as BIC: Back In Character)
Role Players use a OOC/IC format to dictate what is said inside of a role play and outside of it.
So, for example.
Say your role playing partner (we'll work this on a onexone gig for simplicity for now) has just posted his or her reply. You have something to reply with but you're a little unsure of something or that person has stated something which cannot be physically possible of the dimension of the genre. It might look something like this;
OOC: Blitz, we've said before. Bice would have gone through a security search at the airport. To have the Swiss Army Knife on him would be on his person and counted as hand luggage, therefore would have been confiscated because it is basically a weapon. Use a sharp rock or something else but not Swiss Army Knife (Or any other sort of knife you say he had on him) that Bice has on him cause Security would have taken that off of him. If you really want a knife, then have Bice go back to the luggage and find one in the luggage compartment of the aircraft where all the big cases are. You just won't simply find a knife of any description in hand luggage. Security is too good these for even a Swiss Army Knife to be missed, and anyay, SAK's are one of the most recognised.
BIC: Gabe looked at the male with confusion stating clearly he did not understand Bice's meaning. Put together with his concussion and exhaustion, his mind and hearing was becoming distorted. It was an effort to stay awake even though he really tried his best. His hand clenched as his leg moved and pain coursed through him again. If Bice's tactic was working, Gabe didn't show it.
Now, different role players use different OCC/(B)IC systems. This simply means you won't always see OCC and IC in a OOC/IC format. Role Players like to be different in their methods. Their use of OOC definition is the same as how they write.
OOC/IC, ( ) and [[ ]] are among the most common varieties.
Out Of Character speech, if on a Role Play board, should technically relate to the ongoing role play at hand. This is different if you're role playing on a Internet Messenger unless you have more than one account, and thus that is made easier. It's just easier for people to understand what the OOC goes on about if it relates directly to the ongoing role play. Any speech that is considered normal chat can be done by a private messaging system that is available by the RP Board or on a chat board in another section of that site.