If you want to launch into technicalisms, I'll be specific and to the point: "piss poor" is a legitimate expression, in both British and American cultures. "We is" is neither acceptable nor necessary.
It does not matter whether you regard this as an 'internet geek message board' or as a 'discussion forum' (as the rest of us do). The point is to communicate clearly and efficiently and evidently, speaking in some farsical form of adult baby-speak leaves the speaker to be found wanting of the necessary manners to communicate, as I said earlier, in a manner both clear and efficient, and most importantly: polite. Polite to every other reader present on the forum for none of us deserve to be submitted to such intellectual derision.