Rawgabbit

[Rawgabbit]
Definition:

Someone who tries to speak authoritatively about a subject of which they know nothing about. Someone trying to pass as an expert on a topic on which they have no clue.

Part of speech:
Noun
Use in a sentence:
A rawgabbit tried to discuss the intricacies of constitutional law to the professor. It did not go well.
Rawgabbit