The phrase "irony meter" refers to a fictional device that measures or detects irony. It's usually used humorously to indicate that something is so ironic that it would register on this imaginary instrument. Full definition
In the final analysis: If God made me (or you, or my dad, or anyone else) a curious, questioning, restless, cynical, depressive agnostic (irony meter BUSTED! (nakedpastor.com)