Top Definition
calcium, lime, rust, and other such unsavoury substances, especially those tough to clean ones
"Man you just spilled 5 litres of bucket water on my carpet! That's grust."
1 more definition
10 Words related to grust
calcium, lime, rust, and other such unsavoury substances, especially those tough to clean ones
"Man you just spilled 5 litres of bucket water on my carpet! That's grust."

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