MFWG 

Stands for Mother Fucker Whats Good.

Yo mfwg.
Nothing much bro just chillin.

Mfwg.
Just got a pack of brewskies get over here...

MFWG by SaMmmmy October 29, 2012

MFWGS 

MFWGS = My Face When Getting Shrekt.
When you're playing any online game and you get a hack on you're computer and you see shrek and he makes you bend over causing you to get spooked and then you accidentally press the letters MFWGS.

"Yeah i quickscoped him so hard, gimme some pingers mate"
(Shrek comes out of nowhere)
"MFWGS"

MFWGS by xxX69_MFWGettingShrekt_21Xxx February 14, 2015