Top Definition
1. stands for "must be nice" and used sarcastically when someone tells you something that makes them sounds wealthy, carefree, or conceited.
Wealthy Chick: My parents, my sister and I are going to Aruba for Christmas for a week then to Argentina and Brazil to spend the New Year.

Poorer Friend: MBN! shit!!!

Wealthy Chick: What does 'mbn" mean?

Poorer Friend: it means that it Must Be Nice, mutherfucka! Tell your parents to hook ME up!
by El Muñeco December 08, 2005
must be nice..........
GuyA: Damn I'm full, huge steak dinner.
GuyB: I'm eating chicken Ramen, mbn.
by wikked January 06, 2005
Acronym for MUST BE NICE. Usually used on Facebook when someone posts pictures of a fancy car or house.
Brian: Check out my $68,000 Honda

by BAUWLUH August 17, 2011
Jackronyn for MasturBation Nation - A group of outstanding (self proclaimed) men, linked by messaging technology to share in inappropriate comments, sarcasm, and random shenanigans.
Girl A: "Look at that group of extremely hot guys texting inappropriate, sarcastic, highly intellectual messages."

Girl B: "Hot is right. I have always dreamt of being the centerpiece in an MBN circle twerk."
by justsanotherdude December 02, 2013
must be nice
Awn your boyfriend is taking you out, mbn
by you thought ! July 06, 2016
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