nsbi
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
James: Dude there's a hot milf that just walked into your house
Will: That's my mom you asshole!
James: nsbi