Opportunely thesauric

When someone uses uncommon synonyms from a thesaurus at an opportune time either for strong comedic effect, to dramatically emphasize a point, or both.

Used in a Sentence:
"When did you learn all of those fancy words? You've been so opportunely thesauric lately."

-Example in Context-
Person 1: "How's your burger?"
Person 2: "It is simply divine."