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Sexual maneuver administered as a punch to the female genitalia, where the pinky knuckle and the pointer knuckle find contact with the anus and vagina, respectively (general delivery has been described as "Mike Tyson with a swerve").
Things were going great, but then I screamed 'harder!' and he gave me the Portuguese Knuckle!
by Carl Johnson Weathers December 26, 2010
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