The act of Ejaculating on your thumb and shoving it up he/she ass while asleep.
Brad fell asleep early im going to give him a dirty shaba
The act of fucking your partner with a giant dildo while it's suction cup to your forehead
Guy 1: "Why do you have a smudge on your forehead?"
Guy 2: "Me and my boyfriend did a Dirty Chas last night.
Guy 1: "Damn, you guys are really spicing up your relationship."
When you stick your smegma inside your girl's coochie while she's on her period and feeding her the end result.
Brad was so hot last night... He gave me a dirty ravioli.
When you pleasure yourself anally with a banana, and then eat the banana
Being horny and hungry, she decided on a dirty Tarzan before going to sleep
The act of shoving grated beetroot up your ass
I was craving beetroot, so I went home and did a dirty Juste
When you are fisting an ass and grab intestines and pull out.
High on bath salt, bill pulled a Dirty Hazleton on Cathay
This is horrible abuse to do to a person. You rub your knuckle against either your own, your victim's, or a third parties butthole then proceed to rub your "dirty knuckle" against your victim's mouth.
Tiffany: "Danny, if you don't stop making fun of my nips, I'm gonna give you the dirty knuckler!"
Danny: "NAY!"