When there is too much ketchup in those little paper cups so when you dip anything larger than a french fry the ketchup erupts over the edge onto the table.
Fred tried to dip his burger into the little cup and caused a ketchupcano over the table.
Pre Ketchup cum is the almost see through substance that comes out the average ketchup bottle whenever it's poured onto your favourite meal or your just really thirsty
Pre Ketchup Cum is something that 9/10 average human beingsexperience over their lifetime