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."
A dirty cha is when you put your chode in the wrong hole on accident, then stick your finger up their butt, while wet farting on your girl's clean sheets.
Bro I fucked up and meant to do a Dirty Chris, but did a Dirty Cha instead.
An explicit sexual act starts with senior male grooming,as he peaks he busts a nutterino and she keeps slurping on the diddly.
She was so horny she gave him a Dirty Chastity