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1.
someone who does one thing at a time, not able to do more than one thing at a time
I can't multitask, I'm a unitasker
by jeffreygus February 16, 2010
 
2.
An object with one function, ideally, designed to be extremely good at what it does. A waffle iron, for example, can only be used to make waffles, but it tends to make waffles extremely effectively, justifying its existence as a uni-tasker. Objects as varied as saddles to soap dishes or rice cookers can be considered uni-taskers.
The only uni-tasker allowed in your kitchen is a fire extinguisher.
by ElectricSpecter November 14, 2009