More fool (one) British disapproval phrase spoken informal
Used to say that you think someone's action is stupid.
More fool you for not listening to my advice.
They didn't realize how much this was worth. Well, more fool them.
Used to describe someone who is naive, gullible, inexperienced, easily fooled, ignorant, unsophisticated, etc.
To say, or believe something or someone that seems completely crazy, delusional, or stupid
someone who is stupid or crazy
The phrase 'more fool you' has appeared in Shakespeare's The Taming of the Shrew, 1596:
BIANCA: "The more fool you, for laying on my duty."