I love when people try to insult someone by calling them names, and misspell them.
What if they are talking like Bugs Bunny? He often says “Eh, what a maroon!”It’s my favorite.
Currently: “Yeah, ______ was a real maroon, I was so glad she was fired.”
This is correct. Essentially, it refers to someone isolated or left out of the loop.
Source: onemoretimewithfeeling