This whole issue, of regionalist use and level of discourse, bothers me immensely.
Language is a tool for communication – whatever communicates effectively, and expresses conceptual ideas in a manner that can be understood by the hearers, readers, is effective use of language.
The problem lies in the dichotomy between prescriptive and descriptive grammar. “Me go depress submit button now” is poor English on anyone’s standards – it doesn’t match how any English speaker would express that concept. But “I’m gonna hit submit now” is quite acceptable colloquial usage.
The problem is that we are brought up speaking colloquial English, and, in general, not familiar with formal English until we enter school. Thus, we have to be taught what usages are acceptable in formal English and how they differ from what’s acceptable in colloquial. “It is I” at the door of a boys’ treefort is equally incorrrect as “It’s me” in ultra-formal usage.
Both descriptivist and prescriptivist paradigms are partly accurate and partly flawed – it depends on precisely what is being taught and studied. To describe how English is used in, for example, instant messaging or at a bar in Pascagoula, MS, is entirely appropriate, and the results will not be what conforms to Mr. Precise Speech’s Guide to Excruciatingly Correct English.
But the fact is that there is a common consensus that “Then he goes, like, can you ship me 20 widgets by tomorrow?” is not proper business English, and however much “irregardless” works to convey meaning in colloquial speech, it’s improper formal English.
I try to be precisionist in my word usage in posts here, because it is so very easy for an important shade of meaning to be lost through a near-but-not-precise synonym. But I don’t try to write formal English; the SDMB is a medium corresponding most closely to speech between intelligent people. And so I express myself online in the manner that I would in oral discourse, if my tongue worked as well as my fingers. :o [And I can see that quoted out of context, so don’t, huh! :D]