One who is being moronic and foolish and they know that their wrong but they choose to defend and justify them selves and continue to be knu-b's.
It can also be used as a word to explain someones Inexperienceness.
Also another word for "newbie". Simular to "noob" or "noobie"
Ted: Hey bill, remember that guy who was being alittle dipshit last night?
Bill: Yeah! That guy was a knu-b.
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Ted: Hey bill, Did you see that new guy in the club last night?
Bill: Yeah, he was a knu-b to the whole club scene. He was cool though.
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