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1.
HFW
Holy Fucking Wow.

When something is shocking, amazing, unbelievable, or any/all of the above.
Did you see that car drive on water??? HFW!

Did you see that truck fly over the railroad track? HFW!
by socalpie May 14, 2009
 
2.
HFW
Acronym for Hot For Words which is a YouTube Channel featuring Marina, a sexy philologist , who explains the history and meaning of various words via her YouTube Video.
Dude1:Hey do you watch HFW?
Dude2:Yeah, its AWESOME!
by Ti@m@t March 16, 2008