What does "nobody would be caught dead with you." mean?
I guess it means "nobody is dying for you" or "nobody loves you". Am I right or not?
The statement means that other people would rather die than to be seen in your company.
Such hyperbole makes the point that you are not very popular.
There are several words that refer to people who have been rejected by society, such as pariah, outcast, persona non grata, untouchable.
However the statement is generally just an expression of somebody's strong feelings, especially when expressed on social media.