Stands for "My Face When". Some people will type a strange emoticon after or just leave it as mfw.
>mfw :U

>mfw people think this is a remix
by TrashednScatteredD January 09, 2011
Get a mfw mug for your fish Bob.
My feet wiggle.

Used to describe situations where you feet wiggle.
"I can't dance, but MFW when the music starts."

"MFW when you tickle them."
by missjamie75 April 18, 2011
Get a mfw mug for your fish Paul.
My fucking word, a play on "my word", an exclamation typically associated with the 19th and late 20th century upper class.
mfw, how much will that cost!?
by Almighty B January 13, 2013
Get a mfw mug for your dad Manley.
Sam: Yeah last week was horrible, then today she made me sleep on the couch...

Alex: .... mfw man, best fix this
by BlackWite July 22, 2011
Get a mfw mug for your barber Larisa.
"Hey, my mum just told me that my parents are getting divorced"
"MFW!?!?!?!?"
by ConfusedChild July 13, 2015
Get a mfw mug for your barber Jovana.
An acronym for My f*king Word. A expression of surprise.
mfw, my cat just eat one of my headphone ear buds!
by backSLIDER January 16, 2011
Get a mfw mug for your sister-in-law Larisa.