Scum was a slang term for a reprehensible person.

The Clanton gang was described as scum by Morgan Earp. (TOS: "Spectre of the Gun")

Odo was described as scum while visiting Quark's in 2369. (DS9: "A Man Alone")

Aamin Marritza, described the prisoners at Gallitep labor camp, while impersonating Gul Darhe'el, as Bajoran scum or spineless scum. (DS9: "Duet")

Zolan believed that Rugal's Bajoran parents referred to him everyday as "Cardassian scum". (DS9: "Cardassians")

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