mf'er

Military abbreviation for "My Friend."

Sgt. Connelly was one courageous MF'er.

by zabazuve-ha September 19, 2007

Mf'er

Short for mother fucker. Can also be said as mf.

Boy one: HEY! THAT MF'ER TOOK MY MINECRAFT
Boy two: Just let it go dude

by A_Bi_Legend November 11, 2020

MF'er

Mute Forever. Used in elite criminal organizations to show that the wearer is never going to talk about anything with someone outside their organization.

Tiny,"Hey Bob I think that Tom snitched on us."
Bob," Naw Tom is a stand up MF'er"

by ERICWRIGHT075 April 23, 2021