MBF

Acronym for Metro Best Friend

Yvi: Who's that guy over there with the v-neck?
Christine: That's just my MBF, JP.

by TheJBCrew April 28, 2011

MBF

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

MBF

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

MBF

Missionary Butt Fuck

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

MBF

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 March 8, 2011

MBF

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 14, 2008

MBF

MSN Buddy Forever x
If you're friends with someone...but only on MSN, then you are their MBF!!*
Veryy Simple...I know x

Emma Is My MBF!
No, I heard she was Roslyn's.

by Caraa-x October 10, 2006