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YMBF, or better known as, Young Men Butt Fucking, is a notorious E-Posse of young men who like to proceed in indecent acts with one another through digital chat, via gc (group chat) or, vc (voice chat). Voice chats can also use video footage, where they record themselves doing several acts to please the other members in return for semen and acknowledgement.
Lame nigga: YMBF stands for "Your Mom's Best Friend" !!!

Real nigga: No it doesn't nigga
That loser thinks women should obey men? YMBFKM!
Related Words

YMBFFTCAWWBTF 

Your My Best Friend Forever Totally Cool Awsomly Wicked Well Be Together Forever!
Your My YMBFFTCAWWBTF <3
YMBFFTCAWWBTF by Podgey April 12, 2009

ymbfilyf 

you're my best friend i love you forever
You get me so high by the neighborhood!
Ymbfilyf
ymbfilyf by chaexe December 28, 2021