A sex act involving at least 6 people. One person lays down with all their limbs spread out, like a 5 pointed star, and each other person begins using a limb (2 feet, 2 feet hands, face) for sexual pleasure.
Oh my god, this chinese ninja star is amazing. I can't believe where that foot went.
An inefficient sex position in which 5 people of the same sex attempt to grind their genitals together.
"Oh my god, I don't even know why Gay Ninja Star is a thing. It's just a mess of legs!"
When you pick at your face so hard from using Crystal that you gain a 3rd eye between your eyebrows that looks like a ninja star was thrown at you.
Kiesha got ninja starred in the face.
Three or more people simultaneously performing and receiving oral sex by way of lying sideways, mouth to genitals, forming a closed shape pending the number of participants
Pondering the image of more than two people sixty-nining, it occurred to me that it wouldn't resemble the number 69, it would be more like a shuriken, so they would be ninja starring.