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1.
Originally one of the songs featured in Windows Media Player, this term has evolved to mean a good friend of yours, or a "white nigga." Black people are forbidden from using this term. It is strictly used by an elite class of caucasion friends.
Dave: What you up to ninja tuna?

Brian: Nothing just got done jerkin it.
by PweekOnYou November 09, 2013
 
2.
A person, so awesome they amaze every person who sees them... they also have horrible B.O. and breath that smells like Tuna, so you are reluctant to approach them but always enjoy there awesomness from afar.
"Carl is so awesome! but he's more of a ninja tuna, so I don't hang out with him."
by eliwa&kimmy March 24, 2010