i.e. "So then she goes, 'Hey!' and I go, 'What?' because I was on my way out..."
I was musing about this the other day, so I decided to try to find out. Unfortunately, my skills lie in different areas than language research.
My instincts tell me that this is an outgrowth of hippie culture in the West during the late 60's, but I have no proof of this at all. I remember being in elementary school in the 80's and my teachers would absolutely flip out over this construction and lecture "People don't GO, Brian. People SAY." Lecturing notwithstanding, listening to students at recess revealed many students 'going' this or that.
It seems now to be relatively accepted in spoken English, though not written. It also seems to apply to a wider range of use cases than say, e.g.:
"So he goes (makes face like a duck) and then..."
So, it kind of has taken on a meaning of 'to communicate, to embody a message, to say' as well as to literally move from one place to another. At least it has in the midwest...is this in use anywhere else in the US?