Quote Originally Posted by ZainDustin
I've been here constantly for a few months now, and I still don't know the real meaning for "Gah!"

Can anyone help me on that?
In my experience it is mostly used as an dismissive exclamation, but the actual meaning depends on the context: it can mean such things as "This is unimportant", "I don't care" or "This is bad". However, some people use it as a general exclamation.

On the Origin of Gah!