connecting ones own mouth and anus via rubber tube, promoting feces to travel between the two orifices. The literal ass-to-mouth.
Guy 1: Dude!
Guy 2: What?
Guy 1: I just did a san francisco transfer
Guy 2: Get the fuck away from me and brush your teeth
Guy 2: What?
Guy 1: I just did a san francisco transfer
Guy 2: Get the fuck away from me and brush your teeth
by junglebunny420x September 22, 2011

Not even the potential payout would force me to admit I let an old man give me a San Francisco Fedora while I suck and fuck multiple guys.
by VinceMcMahonshitonmyhead January 28, 2024

Someone who changes a lot when exposed to like-minded people of the same age group and interests, fixing the issues they once had with socialization.
Person 1: "I'm sorry for all those things I've said in the past"
Person 2: "It's okay, you've gotten quite better. You're a real 'Jeff-San'."
Person 2: "It's okay, you've gotten quite better. You're a real 'Jeff-San'."
by Bucket2Man July 20, 2021

The act of piling up multiple men (bottoms) on top of each other. Then the top roughly inserts his manhood into each participant starting from the flap jack on bottom and working his way up. The top proceeds to flopp out his load on the bottom, who is located on the top of the San Francisco Pancake. His semen then proceeds to trickle in a downward flow to the other members of the San Francisco Pancake. This should give the perception of a stacked pancake with syrup drizzling down. Like the Canadian Pancake but MORE GAY.
Andy asked me if I wanted to be in a San Francisco Pancake. I replied, "yes, so long as I got to be the flap jack."
by Roostertail September 17, 2020

Sans: What do skeletons put on their roof? SHIN-gles!
Papyrus: ANOTHER BAD JOKE AND I'M FINISHED WITH HIM!
Papyrus: ANOTHER BAD JOKE AND I'M FINISHED WITH HIM!
by Planet27272 March 9, 2025

A brash, yet gentlemanly way to settle an argument. Should one accept the challenge, both participants face their backs to eachother and walk three paces. On the third pace both men face eachother, drop trow, and vigorously masturbate to completion. The winner is the first man to blow his load. Bonus points for ejaculating onto the other competitor.
Hey, did you hear about how mad Jason was when his GF was grinding on Tyrone? Good thing they settled it like men with a San Francisco Duel! Jason never saw it coming!!!
by Rumpleforezkin July 8, 2025

The most beautiful and cutest person you will ever meet. He can act like a newborn baby but can also act very hot and can turn you on. He also loves dolls and likes this little cute doll named "Shiber".
San: *Tongue sticks out*
Fans: YOU BETTER NOT DO THAT AGAIN
San: *smiles innocently*
Fans: STOP DOING THIS TO US
Fans: YOU BETTER NOT DO THAT AGAIN
San: *smiles innocently*
Fans: STOP DOING THIS TO US
by min yoongi. April 17, 2019
