Top definition
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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2
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
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3
Come Irish insult indicating one has Headlice (Nits) or dose not necessarily clean themselves.
You are a nitbag go wash yourself .
by D1boy September 06, 2016
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