Top Definition
Not sorry 'bout it. Used when you don't regret your actions, thoughts, or feelings. Particularly useful in situations where shortened text is the norm (text, twitter, facebook, etc)
In a texting conversation...

James: Dude there's a hot milf that just walked into your house

Will: That's my mom you asshole!

James: nsbi
by funky2fresh May 27, 2011

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