Top Definition
A fionna ninja is AWESOME!!!! It is only given to you. The person that has a H in the begging of his or her name is a fionna ninja.

There is also a monkey ninja, THE BEST THINGS IN THE WORLD !!!!!! They are the best climbers and very sneaky😁
Random dude: Helena is a fionna ninja!!!

Another dude: yea!!!
by Fionna ninja May 07, 2013
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