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1.
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
 
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
 
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