Q, you quoted OED, presumably as a limiting factor on the geographical reach of baps.

Remember that, despite the great respect due to the OED, a dictionary is not and never has been a prescriptive or legislative authority, and may well not be exhaustive on a given word. A dictionary is a report of what the dictionary maker(s) gather actual usage to be, and such reports are not infrequently in error. This includes even the OED along with other dictionaries.

Dave Oesterreich