a young wiffer sniffer
A little kid who thinks they're the best. Said by old people who are still mad about the 2000s.
My dad called me a young wiffer sniffer after I failed math again.
My mom said I was a young wiffer sniffer because I still have a Lisa Frank binder.
My uncle said, 'You're still a young wiffer sniffer, and I'm not even mad.'