Having two duties, or wearing two hats
A boss's act of giving a competent employee an additional duty because:
a) management failed to account for a pressing need while planning
or
b) the employee slated to do that job is essentially worthless, and management feels compelled to task the next guy standing with the bad employee's duties
Since a senior staff member is horrible, my boss dual-hatted me as both logistics and operations manager.

I gave a presentation on maintaining a franchise's books, so the district manager dual-hatted me as both store manager and district comptroller.
by I-95 journey man July 31, 2010
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