The biggest and most cuntiest of all cunts. Generally, thundercunts are incredibly obese and have a portal to Hell in between their legs rather than a vagina.
Bob: Have you met the new girl?
Joe: You mean Meghan? Yeah, dude, she's a fucking thundercunt.
1. a megacunt, usually white trash by nature, who needs to learn when to shut her trap 2. an excessively bitchy person, who spends her days making others feelworthless
At a community service project last Friday a Thundercunt came up to her car and bitched, "Who put a wata bottle on mah car?!?".
That thundercunt Dr Bange failed that group because their memo was not stapled.