I am a user of Stack Overflow. It is perfectly appropriate to refer to me as a SO user.
However, I am not a "stacker".
I do not stack anything, unstack anything, or restack anything as a career. I don't stack anything unstacked or restacked, or unstack anything stacked or restacked, or restack anything stacked, unstacked, or restacked, or repair anything stacked, unstacked, or restacked. As a career, I do not do that.
And really, cutesy names for the users of a web site just reek of boosterism. Is it too much to ask that we just not go there?
My thanks go out to Shog9 for bringing the relevant discussion thread to my attention. Please see also my response. (Note: both have been deleted)