Gilk is the shorthand word for "gross milk".
Gross milk is synthetically created by letting a gallon of milk sit in the fridge for 2 months until it has fully curdled and smells gross. This process can be sped up by letting it sit outside in direct sunlight on a warm day.
My friend hid a gallon of open gilk in my bedroom and now I don't sleep there anymore.
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a way to say: i went to the story to go get some milk
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A combination of Girl and Milk, similar to the combination of Girl and Cock.
Typically used to define which gender the milk was collected from.
With man milk being "Milk."
"Hey Sandra whacha drinking"
"I'm drinking a bit of warm Gilk to get me ready for nappy time"