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"Must be following" on Tumblr; maybe even Twitter.
First 20 to reblog will be promoted. MBF (inserttumblrnamehere).
by sophiechloe January 07, 2012
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3
The term used between close friendships. MBF stands for Mega Best Friend.
Dylan: Hey you're my MBF
Mariam: You're my MBF too!
by mari__ December 26, 2013
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4
An acronym for "Milky Bum Factor"

Anal perspiration caused by hot and humid conditions. Leaves one's bum feeling moist an unclean. The higher the MBF factor, the worse the milky bum feeling is.
Seriously, it is so hot & humid outside i think the MBF is at 9.5 today.
by awefsvc July 14, 2010
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5
Sarah: Oh my G I hurt so bad.

Jessica: Why's that?

Sarah: Well I let Steve missionary butt fuck me (MBF) and now I am afraid I will have to steal some of my grandma's diapers so I don't shit my pants.
by two lips May 18, 2010
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6
Abbreviation for "must be fried." Said when someone says something so ridiculous, they must have been fried.
you- OMG i wanna see that movie! i had a dream i saw it, but i never actually saw it... this is like SO much fun!!!!!!!
me- damn you MBF.
by NPENN GETS FRIED February 22, 2011
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7
married black female, same thing as mwf except she's black
looking for mbf to hook-up with this weekend, it's always been a fantasy of mine.
by Chanticlear January 07, 2008
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