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a jack rat is like a pack rat but instead of hoarding stuff he hoards his cum and keeps it cold in a jar like it's gonna expire if it's not refrigerated.
I found a whole fridge full of mayo jars full of his cum. It was like a cum fridge.
He said he was saving it for a rainy day. I think he means a day with no cum.
He tried to sell me a jar for $20. I told him I'd pay $5 if he let me taste it.