This forum uses it in a bizarre way I'd never seen before... I always thought of it as exactly what it stands for:
White (obvious enough)
Anglo Saxon (English/German/Northern European with fair features)
Protestant (mainline denomination, not evangelical).
I've heard that definition a lot, but
1. In which way are Germans and Northern Europeans Anglo Saxons?
2. Isn't Anglo Saxon almost redundant in this case, because how many White Protestants are there historically that are not British, German, Dutch or Northern European? (Huguenots? Hussites? Valdesi? Sobozinians?)
Anglo Saxon is but one Teutonic tribe (granted, the English more or less are a meld of Anglo Saxon and Norman (another Teutonic tribe). But a definition of WASP that is co-extensive with Protestants with Teutonic genetics, is perhaps pretty accurate (except perhaps for the Celt Protestant Scots and Welsh). Of most import vis a vis the US, is the issue is whether Scots-Irish are considered WASP. There are millions and millions of them, and they were the Celtic Scots colonists imported from Scotland into N. Ireland by William of Orange (thus they called themselves "Orangemen"), to help "pacify" Ireland. The Scots Irish have a rather distinctive cultural style and heritage, light years apart from the flinty Bible toting highly educated relative speaking, New England Yankees - the former being just perfect for the frontier, which is why they were favored as immigrants in the first half of the 19th century.