1 definition by hh8450
The abbreviation for You Don't Know Who You're Fighting For. The title of a song by the Montana band Frosted Grinch.
Music buff: Hey, did you hear that new song by Frosted Grinch?
Clueless person: No, what's it called?
Music buff: YDKWYFF
by hh8450 Jan 26, 2008 add a video