Zabasho
Zabasho - (Hebrew: זבש"ו) - can be literally translated to "It is his problem", but is usually meant to also express complete disinterest in the result of an action done by someone else.
Example: "If he will send that email, he is getting fired, I told him that. Zabasho."
Ayende's Example: "The user wants all the screen aqua on pink, he will go blind. Zabasho."