A word of no meaning other to certify you heard what the other person said, it conveys no emotion. Most commonly used on an instant messenger to stop someone bothering you. Can be used in place of swear words in everyday life.
1. Person A: Are you ok? Person B: Mef
2. Person A: Is something wrong? Person B: Mef
3. DVD fails to record a tv program you wanted to see but could catch another time 'mef' said outloud
2. Person A: Is something wrong? Person B: Mef
3. DVD fails to record a tv program you wanted to see but could catch another time 'mef' said outloud
by Candlemoth September 22, 2008

Mother Everyone's Fucked. Derived from the example of MILF as noted in the classic movie, "American Pie". This term is used for a female who use to be a slut, but then settles down, gets married and has a kid.
"Damn, I ran into Jen today and found out that she's married and had a baby. You remember Jen don't you?? What a MEF!"
by KiKKi January 14, 2006

by DoomLord June 25, 2009

The Queen of the Geeks. Speaks with a heavy lisp through a retainer and makes many 'alien' hand gestures to get points across. Watch out for flying saliva.
by Steezus January 03, 2004

a short form of, or rather, more polite way in saying mother-fucking. Derived from effing which means fucking by adding a 'M' in front of the word. Hence 'M-effing'
by LG Godwin November 02, 2008

by cambray January 03, 2004

by TINA March 02, 2005
