A person who is a fan of a noob. A person is a fan of someone's work or gaming skills
thinking they are a pro without realizing that
the person they are a fan of is not
actually a pro but a noob (newbie).
He's a foob of John. (This implies John is a Noob)
He's my foob. (This is implying
that person saying this is not
very good at
something, a modest way of saying he's my fan.)