Also found in: Acronyms.
slang An initialism of "my face when," used primarily in online communications alongside images of humorous facial expressions to indicate a person's typical reaction to something. She replied to my SpaceBook post with, "MFW people post pictures of their vacation" above a picture of a snoring child. It was a bit rude, but I also couldn't help but laugh.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.