dictionidiot
Somebody who pretends to have an expansive vocabulary, but is in reality using words which they've either made up or don't understand.
Dave: John told me he really acquiesced his potato soup, what's that mean?
Carl: Don't worry about that, he's not even using it right he's a Dictionidiot
Carl: Don't worry about that, he's not even using it right he's a Dictionidiot