To be uninteresting or boring, to the point that you resemble an old man.
Used as a noun, verb or adjective.
Only a male can Walter, though a female can Agatha.
1. Dude, you're being such a Walter. Why would you want to go bowling? UGH.
2. Look at that Walter over there. He's wearing a tweed jacket!
3. Oh my God, he's dating a sixteen year old? That's not very Walter of him.
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