A sexual act in which a male places his penis head against either nostril of his partner just prior to ejaculation. Once ejaculation is imminent, the male exhorts, "I'm going to cum!". The 'detouree' then takes a deep breath through the nostrils, forcing the seminal fluid into the stomach by way of the nose--rather than the mouth--as is typically expected.

Note: If two men ejaculate in either nostril of the 'detouree', this is referred to simply as: A double detour.
"I'm sick and tired of having my genetic fluid travel down the same ol' street. This time it's going for a detour. A San Francisco Detour."
by Lah22 October 5, 2011
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A chonky seal with a syringe in it’s head
Friend 1: Yo I was sticking syringes in my seal’s head
Friend 2: Wow you really were making a San Francisco Narwhal
by Biglad412 March 6, 2022
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No, we are not in fact San Francisco roommates.
by automaton5 January 4, 2008
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A National League baseball team with the best pitching staff in the MLB and the worst hitting in the MLB.
John: Fuckin' a, the San Francisco Giants hitting is once again terrible this year.

Mike: You know, they say defense wins ballgames. With Barry Zito, Tim Lincecum, Matt Cain, and Jonathan Sanchez, their pitching will be phenomenal this year.

John: Yeah, too bad they haven't scored a run to back that up since the Nixon Administration.
by NotAustinIswear May 23, 2010
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A two-pair poker hand in which two queens or two kings are present. San Francisco is often generalized as having many homosexual individuals and being on the forefront of gay marriage; thus, having two queens, or "women", or two kings, or "men", creates a gay "wedding/marriage" and a San Francisco Wedding.
Joe, Sarah, Bob, and Anna are playing poker.

Joe: "I'll see your $20 and raise you $50"
Sarah: "I call. I've got a San Francisco Wedding."
Bob: "What's a San Francisco Wedding?"
Anna: "A two-pair with queens or kings, Bob. I've got a full house, though. PWN!"
by dghul July 12, 2009
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