da fuck

either why the f-ck or what the f-ck
da f-ck you do that for?

da f-ck you doing?
why?
he lays down a monster…da f-ck did you lay that down???
commonly used when your f-cking confused as sh-t
da f-ck is yu doin n-gg- ?
usually used when something is so outrageous that what the f-ck no longers shows how outrageous that said something is
bob- sally hunnie i cheated on yu with a prosistute and yu might have herpes

sally- da f-ck
to inquire, ask for clarification…
as in-what da f-ck?!
when one witnesses something so outrageous that there is no time to complete the sentence. also used for emphasis on “f-ck”.
boss: do you see that sketchy guy covered in dust walking towards the store with surgical gloves on?
worker: he best not be coming in

-man walks in-

boss: well, i gotta go
worker: da f-ck?!?!
huh?
what the heck?
what in the world?
short form of “what the f-ck?”

commonly used when trying to understand something incomprehensable
ikurama masato the foreign exchange student from j-pan read the newb’s post in the forum / chat room and proclaimed “da f-ck isu hi tarukin abaato? yuusu riaru engirishu idiato!” and promptly began typing his insulting reply.