Top Definition
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 04, 2011

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