What is Slippery Ninja?
When one male sneaks upon another male and inserts (slips) his "ninja" into the anal cavity.
Bob: Rob passed out drunk last night..
so i gave him a SLIPPERY NINJA!
Ralf: WAY TA GO!
Kim: AHHHHHHHHHHHHHHHHHHH! me too!
See slippery, ninja, anal, sex, lube