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1.
Instant messaging acronym for Too High To Function. Meaning that the speaker is too high to understand/make sense of what you are saying.
Jack: dude ijust smokeed a wohle blunt by meself an im thtf
von awesem0 10. April 2009
 
2.
Acronym: "Too High To Function" (as in, the speaker has ingested an amount of marijuana to the point that he/she can no longer comprehend or perform basic motor skills.)
Person 1: Sup?
Person 2: In my speech class THTF
Person 1: Shit.
von (lexi[con)artist] 17. August 2011
 
3.
an acronym meaning Too High To Function, normally used in txt or over IM when someone keeps telling u things and ur too high to understand/care what the heck they're saying
person 1: guess what! i think i figured out why my fone didn't work cuz the thingy broke and then that one part got fixed and then it only sorta worked ya know?

person 2: THTF dude tell me about it later.
von poptartxoxo 12. September 2010
 
4.
acronym for: Too H I G H To Function.

used when a person has smoked a lot of marijuana and proceeds to the state of thtf.
I just came back from an L ride, and im sooo thtf.
von baby smiley1 19. Oktober 2010
 
5.
Too High To Funtion.
"I can't drive to the store man, I'm T.H.T.F"
von Kyle Tigue 1. März 2008
 
6.
Too High Too Function. (As in when you get really baked and are unable complete basic tasks.)
Im Parallel parking, but since I am THTF its not gonna happen.

My girlfriend was THTF while making noodles after a bong hit.
von Zauy 18. September 2013