An insult to someone - originating from the negative connotations of a nitty.
"That Jono guy seems like a huge nitbag."

"Yeah, he is. Even Tom is cooler than him."
by tomlawler July 07, 2013
An empty nutsack; a scrotum that is sans testes.
My brother felt bad looking at his dog's nitbag flapping in the wind so he bought him a set of Neuticles.
by Doctego September 23, 2006

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