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The act of having intercourse with a woman who is menstruating , while both partners are in a plastic bag, so that blood pools at the bottom of the bag. The blood filled bag is afterwards referred to as the "ketchup packet"
Guy 1 "Last night i totally did a ketchup packet with your mom and then hit your dad in the face with it"

Guy 2 "FUCK YOU ASSHOLE!"
by bujo March 24, 2007
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May 18 Word of the Day
When you think up something brilliantly righteous while baked.
X: I had this great highdea last night
Y: You clearly were philosopher stoned.
by TripleWest September 03, 2012
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2
The act of wearing a condom and having sex with a woman who is on her peirod, then taking the condom off and making her squeez the menstral blood in to her mouth, as if drinking ketchup form a packet.
Ashley was on her rag and was very horny, and the only way paul would fuck her is if she agreed to take a ketchup packet afterwords.
by Druskeet November 09, 2007
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3
Widely believed to have been invented by Sir Isaac Newton after a detailed study of male sexual arousal, the ketchup packet involves the caressing twist of a man's testicles until they burst. Often, the scene can resemble a McDonald's after a five year old threw a ketchup packet against the wall. A 2005 survey estimated that over 9000 American males have had their testicles surgically reattached so that they could once again experience the joy of a ketchup packet.
"Hey Jimbo, this hamburger needs a little of your personal flavor. How about we bust a ketchup packet?"
by aksdhjgo;asujglksgj November 09, 2008
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4
When your girl is on her period and you squeeze her so blood comes out her vagina.
My girl is on her period so I squeezed her and called her my ketchup packet.
by MEMEBIGBIGBOY October 08, 2017
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5
When your trans-male boyfriend is on his period.
My boyfriend Kai called me a ketchup packet because I am on my period lmao
by Erawr;) April 24, 2021
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