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Kef kef, em'tada

kef=how
em'tada = was went
كيف اتمضى (في العامية) =كيف انمضى(في اللغة الرسمية)
For example : How the exam went ? kef l moseba'a em'tada ?

Maybe kef kef means here the same it's not standart arabic for sure , it's some arabic , for example when you want to buy sweets and the seller ask you which color red or white... but you don't care about it's color you just say "kef kef" :) . And for the other word i don't know what it means sorry .

keef = how ( in standard arabic it's Kaifa كيف )
em'tada= if it's not egyptian dialect then I guess the origin of the word is mada مضى which means " something gone/ past "
so it means " how did it go? " but not " how is it going?"
:)

kef kef = some people use it as "excuse me?!" for shock/surprise or question

em'tada = when did that happen?

so i think the whole sentence was excuse me! when did that happen?
(surprise and question)
some people use it when they have no idea about the topic you are talk,so that gana be their reply,means like=> i have no idea about what are you talking about!
or i have no idea when did that happen!

hope this help