n00b13
A person who tries to act cool but fails. They’re like a dog who thinks they’re a lion but just barks at the mailman.
"You're a n00b13. You can't even play this game properly."
In chat: "This guy is a n00b13. He tried to use a spell but messed it up."
DM: "You're a n00b13. You can't even log in."