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boring old fart
An older person, typically male, especially one whose views or attitudes are considered boring or old-fashioned. Ah, don't mind that boring old fart. He's just cantankerous because he isn't up to speed with the way of today's youth. I've fully embraced that I'm going to be a boring old fart when I get older.
boring old fart
and BOF phr. & comp. abb. a very boring older person. (see also birds of a feather.) Bob’s dad is a vintage BOF. But all old guys are. Don’t be a boring old fart. Let’s go out tonight.