The weird, liquid-y stuff that comes out of a ketchup bottle if you don't shake it.
"You gotta shake dat ketchup bottle, or else ketchup pre-cum will be all over your hot dog."
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The watery bit of ketchup that comes out when you go to use the ketchup but the bottle hasn't been shaken up or it has been left a while without being used. This leads to a puddle of watery ketchup being left seeping onto your plate and probably on your hands.
"Ew, I forgot to shake the bottle, now there's Pre Ketchup on my chips."
"Don't forget to shake the bottle or you'll get Pre Ketchup."