MUMF

(n.) abbreviation

Mean Ugly Mother Fucker. Usually referring to a gentleman of large physique, generally over 6ft with a Viking/biker like appearance, often astride a motorcycle.

When no riding like a twat can often found in biker bars, drinking copious amounts of alcohol and leading a life of debauchery and mayhem.

A term used to reference cannabis/marijuana/weed.

(n) a fat vagina. usually used to describe a visible fat vagina through overly tight clothing on women.

verb
to mumf
the activity of sniffing ladies bicycle saddles
Royal Navy slang.

(n.) abbreviation
Messed Up Mother Fucker

Function: Adj.

Inflected forms: mumfed,mumfing

Definition:
a. To screw something up beyond all hope of recovery or repair

b. An attempt to undo a clumsy action or poor decision that actually results in a more catastrophic result than if the original action or decision had been allowed to proceed.

massive ugly monster fanny
a fat possibly smelly vagina