Lexical exaggeration

1. (noun) A phrase or sentence that exaggerates its vocabulary to an unprecedented extent. This is usually done in a joking manner or to seem intelligent. In the latter usage, it often backfires, making the speaker seem pretentious.
2. (noun) The act of using a lexical exaggeration. (see 1)

Speaker 1: Sorry for bumping you on the shoulder.
Speaker 2: I personally did not appreciate the manner in which you interacted with my glenohumeral joint. Due to this misdemeanor I will not engage in the acceptance of your apologetic response.
Speaker 1: Wow, thanks for the lexical exaggeration, asshole.