you can't make this stuff up exclamation 1phrase 1 exclamation1 •Used to express how ironically unbelievable or ridiculous a situation is. phrase1 •The reality is so bizarre, ironic, or comically coincidental as to be unbelievable.I can't believe it. Elena is my sister's husband's brother's daughter, and her mother is my boyfriend's deceased wife. You... you can't make this stuff up. — 2011