Generally a ginger haired, female or male, who actually thinks he or she is a REAL ninja. Or has ninja skills.
However can be an insult to many gingers who agree with the fact "ninja's are cool"
It Means : Stupid Ginger, you could never be a ninja!
Ginger "I think Ninja's are cool, wouldn't mind being one myself actually"
Person 1 "Ha! You Ginga Ninja! Ha Ha Ha!"
Ginger "I am a Ninja! I have ninja skills, ninja powers and a real ninja sword! And a few deathstars, but they are in the post"
Person 2 "Ha Ha! You Think Your a Ninja! You Ginga Ninja!"