Picture the edge of a road the day after snow: it is not snow any more and it is not water yet. It is soft, heavy and half melted, it has no shape of its own, and your foot goes into it with a wet noise. Hold that texture — half solid, half liquid, shapeless, a bit grey — and every use of slush on this page comes from it.
From the word’s history
Wiktionary's entry says slush may be a variant of sludge, or imitative like slosh, and perhaps a mixture of both influences. Either way the word points at something wet, thick and noisy — which is exactly the picture above.
本包提供的詞源說：slush 可能是 sludge（爛泥）的變體，也可能像 slosh 一樣是模仿聲音來的，甚至可能是兩者互相影響的結果。兩條線索都指向同一件事——又濕又稠、踩下去有聲音。這跟上面那個畫面剛好對得起來。這裡只是把資料上的說法轉述，不是確定的結論。
Wiktionary (kaikki extract) etymology for slush: "May be a variant of sludge or imitative like slosh. Perhaps a confluence of both influences."
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