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Often you'll see someone write a "Pompous Ass Word" online. I'd really like to have a word on hand that has the meaning "A word you don't know so you have to look it up", or something to that effect. So when someone else reads it and googles it, they hopefully have a little smack of self-awareness.
Example uses would be some sort of parody of their writing, or something like "Must you use a [...] just to sound smart?"