The W and P were added in the 1950s to form a humorous epithet to imply "waspishness" or someone likely to make sharp, slightly cruel remarks. Political scientist Andrew Hacker used the term WASP in 1957, with W standing for 'wealthy' rather than 'white'.
What does it mean to be called Waspy?
waspy (comparative more waspy, superlative most waspy) (slang) Like a wasp (white Anglo-Saxon Protestant), a member of the dominant American upper-class culture.
Where did the term WASP originate?
The acronym WASP derives, of course, from White Anglo-Saxon Protestant, but as acronyms go, this one is more deficient than most. Lots of people, including powerful figures and some presidents, have been white, Anglo-Saxon and Protestant but were far from being WASPs.