While performing vaginal sex in the missionary position, a door knocker is the act of the man's ball sack gently tapping against the woman's butthole during each thrust. A play on the phrase, "he's knocking on the back door." In which a man suggests or non-verbally asks a woman if he can perform anal sex by tapping her butthole with his penis.

I was with Ron last night. He could not leave that door knocker alone!

Door Knocker by rhastings88 April 3, 2009

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Argentinian door knocker

While receiving a blow job in a standing position, the guy lifts his Wang stick out of the way and proceeds to knock his fleshy sack against his partner's forhead. Also known as the upright version of the infamous Tea bag or the reverse version of the Cowgirl Tiara

"Wow Vanessa! I love your new hair cut, those bangs sure do make me want to give you an Argentinian door knocker"

Argentinian door knocker by paddleB September 1, 2014

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prussian door knocker

when a man walks up from behind another man, sleeping or awake, pulls out his junk and slams it down into the face of the other man.

i gave jacoba prussian door knocker that almost broke his nose!

prussian door knocker by ronniew October 18, 2006

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