A maned cat is someone who thinks they deserve respect for something that they really don't, like a cat wanting to be treated as a lion for gluing on a mane.
That cop told me I needed to show him respect because he had a badge, what a maned cat.
To spend a lot of time on one particular thing but still do a horrible job at it.
Tom spent his entire Christmas break writing an essay, but he still got an F on it. Even though he tried his hardest, Tom Gucci Maned his Christmas break.