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1.
a shot which includes one 3rd whiskey, vodka and jag.
bartender, "what can i get you guys"
girls, "we would like 3 musketeers"
bartender, "comming right up"
by mcollege October 25, 2010
 
2.
People who cheer, support, value, appreciate, applaud, endorse and invest in the efforts of Elon Musk, founder and/or co-founder of Tesla Motors, Space-X and Solar City among others

Investors in Tesla Motors.

Owners of Tesla cars.

People who work with or for Elon Musk's companies.
Stock traders have shorted Tesla to their peril so far as Musk and his Musketeers have proven they can deliver the goods in the form of the Model S which Consumer Reports said was the best car they ever tested.
by CaptainQuirk September 18, 2013
 
3.
four people that do everything together

see: losers with no friends
i love my musketeers.
by lindsay June 01, 2003