What is Mfy?
1.
Mother Fucking Yankees
BOS defeats MFY!
MFY TO LOSE 15 GAMES IN A ROW!
See
2.
Mother Fucking Yes
"CAKE IS THE BEST FOOD EVER, Y/MFY?"
See
3.
Gay acronym for Mother Fucking Yankees. Those homo's in Red Sox Nation use it because they're jealous of everything the Yankees have that they don't. Like real fans.
Gay Red Sox Fan: I love penis but it hate the MFY!
Yankee fan: Shut up faggot, go cry in the corner with your Bill Simmons column about how great the Sox are even though they just blew a 14.5 game division lead.
See