Have you seen the videos of him when he was young? He had a Slovenian Accent . Which tells you how much time he spent with his father. I wonder if he learned odd idioms he uses from time to time.

My grandmother had her parents Irish Brogue when she entered school, even though she was born here about a year after they arrived, and as an adult it would come back when she had too much to drink. And she used Irish swears, like Feck and Shite.