wouldn't be seen dead with
1. Would never spend time or associate with someone. Are you kidding? I can't ask her out—she wouldn't be seen dead with a guy like me. These allegations and rumors are all untrue. I wouldn't be seen dead with that producer, not after the things he's done.
2. Would never own something or have something in one's possession. My kids wouldn't be seen dead with the old cell phones we used to use when I was in high school.