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.
af Doctego 23. september 2006
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."
af tomlawler 7. juli 2013
Come Irish insult indicating one has Headlice (Nits) or dose not necessarily clean themselves.
You are a nitbag go wash yourself .
af D1boy 6. september 2016
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