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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
nsbi by funky2fresh October 8, 2011
Related Words
NSB NSBM nsb823 Nsbb NSBD NSBE nsbem NSBF NSBHS nsbi
National Socialist Black Metal. black metal which contains racist beliefs, essentially. NSBM bands are usually, musically speaking, of the kvlt persuasion, with the local folk instruments thrown in here and there.

NSBM bands usually draw their lyrical inspiration from pre-Christian heathen traditions rather than Satanism, and usually ascribe or claim to ascribe to the standards of honour supposedly upheld by these ancestral folk.

Somewhat confusingly, NSBM is most popular in the Slavic regions of Eastern Europe; one of the biggest names in the scene, Rob Darken, is actually from Poland, surely the last place you'd expect anything remotely Nazi-esque to be taking root.
"Why listen to NSBM, man? Regular BM isn't extreme enough, you need it to be Nazi as well?"
NSBM by Dave June 19, 2004
An area located in Australia where the government is a Malteser and 2 white guys that will ruin your life and take your phone while giving you afternoon detention. Using a device within a 10km radius when you aren't supposed to will activate the Malteser's special ability, giving the heavily waxed man an opportunity to strike from the shadows and summon your parents.
Person 1 : Hey which school u going to?
Person 2 : NSBHS *insert skull
Person 1: Damn
NSBHS by RadioactiveCosmos July 28, 2022
Stands for "No Sex Boy Friend"

A guy in your life who calls you every hour, gets mad when you don't call him back, gets all emotional about your relationship but have absolutely no SEX with each other at all!!! aka. your best guy friend in the entire world or your boy friend without any perks, opposite of friends with benefits
"Jonee my NSBF just flipped out on me on facebook because I didn't call him back last night"
NSBF by misssssy August 21, 2007
1)National Socialist Black Metal

2)Black metal that promotes White Supremacy and other National Socialist ideals.
Warbutcher is my favorite NSBM band.
NSBM by Gas Chamber Operator June 22, 2008
Abbreviation- New Strong Bad E-Mail

lets people know that strong bad has posted a new email.
toby - "nsbem"
sam - "yeah i saw it this morning"
nsbem by Sam April 12, 2005