htfsik 

How the fuck should i know?

-A more emphatic way of saying idk

-Whats the name of the song?
-htfsik?

htfsik by MrLore December 31, 2006

HTFDIK 

How The Fuck do I know

Girl: Do you know where I put that thing the other day?
Girl 2: HTFDIK

HTFDIK by Arekandera April 18, 2009

HTFWIK 

Instant messaging way to say: "How The Fuck Would I Know!"

James: Yo man, what time do I have class tomorrow?
Trevor: HTFWIK??

HTFWIK by Crazy_C July 31, 2005