(variant of "multitask")
To simultaneously perform all aspects of a given job. Usually used in reference to a fast-paced workplace when an employee is abandoned by all of his or her co-workers and forced to get the entire job done alone.
For example, an employee working at a fast food restaurant all alone must juggle taking an order, performing the cash transaction, making the food, dressing the food, packaging the food, and filling drinks all at the same time to minimize the total time taken to complete the order - when each of these different tasks is normally assigned to a separate person.
At night, I run this entire place myself. I don't just multitask, I have to omnitask.