1. noun Someone who is old-fashioned or crotchety. Brenda's friends call her an old fuddy-duddy because she never stays out past 9 o'clock at night.
2. adjective Old-fashioned or crotchety. You look a little fuddy-duddy. You don't have to get so dressed up, we're just going to the movies.
fuddy-duddy
and fud (ˈfədidədi and fəd)
n. a stuffy person; an old-fashioned person, especially a male. There seems to be a convention of fuddy-duddies in the park today. I woke up some old fud sleeping on a park bench. He was mad.