BMFH 

Bastard Manager From Hell. (Typically a former BOFH.)

That new manager in SysOps is a BMFH. I hope I don't end up reporting to him.

BMFH by Eater December 16, 2008

BMFH 

Big Mother F**king Hammer. Originated in the military to describe extremely large hammers.

"Hey, pass me that BMFH on the desk over there."

BMFH by Wouldn't you like to know? Yes? Well too bad. January 21, 2008

BMFH 

Bastard Modules From Hell for use with the Airc++ script for Mirc. Created by Netscrape.

BMFH by Anonymous June 19, 2003

BMFH 

Big Mother Fuckin Hooters

man she has some BMFH!

BMFH by Smitty May 23, 2003