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1.
Performing 5 or more tasks at the same time. Mega-tasking should not be attempted if you are an idiot.
I was working on an excel spreadsheet, writing a word document, taking on the phone, checking my email, eating lunch and drinking a soda at the same time... I was mega-tasking.
by Lobozzo February 03, 2006
 
2.
Is when someone delegates multiple nested tasks ( tasks that themselves require multitasking) at one time, setting of multiple chain reactions of events, communication and assignments at one time. Ie multitasking multiple tasks at once.
Not now chief. I'm megatasking.
by EricWags November 18, 2010