wouldn't be caught dead (doing something)
Would never (do the thing being discussed). I wouldn't be caught dead wearing that shirt. You can burn it for all I care. She had always said she wouldn't be caught dead working for that company, but I guess everyone has their price.
caught dead, wouldn't be
Also, wouldn't be seen dead. Would have nothing to do with, detest, as in I wouldn't be caught dead in that outfit, or He'd not be seen dead drinking a cheap wine. This hyperbole is always put negatively. [Colloquial; first half of 1900s]