For Ebay users means "hard to find", abbreviation used to save space.
"RARE 1823 ROMAN LITHOGRAPH HTF ORIGINAL ANTIQUE PRINT"
it means Hand To Forehead.
it's when someone does something unbelievablely stupid
and it's ment to save time, and move on.
"NO, George W. Bush is doing the BEST he can!"
"htf"
Who The Fuck. Usually used when angry at a specific person.
HTF Just ate my sandwich?
Some guy just got robbed of his XBox 360! HTF would do that?