Literal translation
every single time, an eye falls out of him
Meaning
it never happens
Explanation
A way of saying something never happens, on the model of the impossible comparisons found in many languages, such as hens growing teeth. It is mostly used in a structure like every time he tells the truth, he loses an eye. The image of the lost eye recurs often in Provençal expressions to mark a flaw that ruins everything, like a beautiful girl missing an eye.