Short for "Try Harder Faggot".
Person 1: "I CANT LOOT THIS ITEM"
Person 2: "THF"
short for "the fuck"
originally created from the game dungeon fighter online, due to them have too many censored words
Wammer:how the %$#@ we all lost?
Rasendori:thf?
Short for "Thats Hella Funny"
"haha did you see her fall?"
"Yea thf."