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.