Definitions by xkcd42

SMILF 

broken smile

This can represent either a half hearted attempt to smile
-or-
A faked smile to hide your true emotions

I was depressed and my attempt at smiling was no more than a SMILF.

I SMILF'd at that jerk Joe who thinks he's my friend even though I publicly dislike him.

SMILF by xkcd42 February 26, 2009