Definition
Your girlfriend or boyfriend's dad, whom you must impress without the legal protection that marriage provides. He's technically not your father-in-law, but he's definitely judging whether you're worthy of his child. One wrong move at Thanksgiving and you're toast.
Example Usage
My father-out-law just asked me about my 'five-year plan' while we were watching football, so I guess this is getting serious.
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=father-out-law&defid=9116387)
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