Top Definition
Failing at each and every task when multitasking.
I attempted to multitask by taking the mail to the post office, going grocery shopping, and getting an oil change, but instead wound up multifubaring by losing the mail, forgetting my money at the register, and slamming the car into the Jiffy Lube entrance. FML.

Today was another fine day of multifubaring at the office. I think my boss will fire me tomorrow. FML.
by Farm Love November 28, 2010

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