something that is extremely clever or brilliant and excellent at the same time or something that is awesomely clever. can also be used when you cannot decide whether to use brilliant or excellent
The inability to properly use Excel. Most often people over the age of 40, with a strong propensity to destroy formulas. These people often use scratch paper and a calculator to overcome the burden of understanding how the worksheet operates.
A phrase often shouted after succesfully completing a mission.
A famous southpark episode depicts Al Gore shouting "Excelsior" after defeating Manbearpig.
Unfortunately, Al Gore is still searching for Manbearpig in real life.