When you are engaging in anal sex (doggystyle position) & some poop comes out. So you scoop it up with both your index & middle fingers (on both hands) & proceed to swipe the feces under your eyes, like a warrior! A Dirty Warrior!
Last night, Mikey & Erica did a Dirty Warrior!
The act of engaging in anal sex (doggy style position) and feces comes out, so you proceed to take your index fingers on both hands and scoop it up and swipe it under your eyes like warrior paint, and proceed with the deed.
Mikey was giving Erica anal, and a little poop came out, so he became a dirty warrior.