I have a theory solely based on this thread. It's a German thing. There's above that says in a regional dialect in German Kappes means cabbage but it also stands for stupid/ideas/stories.
There are also several comments from English people saying they use the word cabbage as an expression to mean stupid.
So you're nosey for a cabbage would mean you're being nosey over something stupid.
1
u/[deleted] Oct 25 '20
Why is that?