When a man marries a woman, and proceeds to perform bedroom antics with his wife's sisters, because this guy is void of any kind of moral compass, and/or is just a complete douchebag.
Girl - "I can't date that dude, he's such a Sinister Stanley!"
Girl - "Did you hear about Dave? He totally did a Sinister Stanley on his wife".
Man - "I have so much respect for Brian. He Sinister Stanley'd the shit out of his wife!".
Girl - "Did you hear about Dave? He totally did a Sinister Stanley on his wife".
Man - "I have so much respect for Brian. He Sinister Stanley'd the shit out of his wife!".
by DirtyDave2.0 August 13, 2022
Get the Sinister Stanleymug. by Yelnats May 23, 2020
Get the Uphill Stanleymug. Very similar to a Cleveland steamer and a Cincinnati steamer, the Stanley steamer includes defecating on a person. Though a Cleveland steamer includes the face, the Cincinnati steamer includes the body, but the Stanley steamer includes defecating on a person's feet, then mixing the feces in your Stanley cup, using the toes of the person to mix them in.
I hit up this softdom mommy to have a fun time with, she told me she was dieting with fiber, oh man i hope she gives me a Stanley steamer!
by funxey_pls April 19, 2025
Get the Stanley Steamermug. by Ayanna is swag 🤑 June 3, 2021
Get the Carli Stanleymug. 
omg its Stanley the guy from Fortnite
by Moma suckaaaaa March 31, 2023
Get the stanleymug. by Paul Phinebaum January 6, 2024
Get the Stanley Steamermug.