To zarf something means to misrepresent or misunderstand something in a huge, embarrassing way. It's a neologism created by writer/performer M. C. Brennan, in affectionate reference to the character of Zarf on "All My Children". The antonym of grok.
Dude, when I said I liked metal, I meant Metallica, not Stryper. You totally Zarfed me.
Zarf is a term for an authorized hacking assault on a computer system, for purposes of testing the sytem defences. The useage is military and government. The term zarf was recently declassified, but not defined, by the American military.
The CIA autorized a zarf of the Pentagon invoicing system.