wumps is an acronym standing for white upper middle private school. technically it should be wumcps (the c standing for class), but the c is dropped for ease.
like the american term WASP, but more international.
originating in London, England.
often changed to wump or wumpy in conversation.
"Will is such a wump."
"Ha! what a wumpy outfit!"
"This place is full of wumps."