When a member of the older generations nags/harasses younger people for doing things that while quite common nowadays people might have been picked on for .. 30 years ago. This includes but is not limited to flat brim hats and the way they are worn, baggy or loose clothing, using new age vocabulary, dropping the g, etc. People that exhibit this usually have grey hair and almost always have mustaches.
Mr. Brown has a severe case of oldbaggery.
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