scum

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scum

1. the greenish film of algae and similar vegetation surface of a stagnant pond
2. the skin of oxides or impurities on the surface of a molten metal

scum

[skəm]
(materials)
A film of impurities that rises to or is formed on the surface of a liquid.
A slimy film formed on the surface of a solid object.

scum, scumming

1. A surface deposit sometimes formed on clay bricks; caused either by soluble salts in the clay which migrate to the surface as moisture escapes during drying (drier scum) or by the formation of deposits during kiln firing (kiln scum).
2. A mass of organic matter which floats on the surface of sewage.
References in periodicals archive ?
The world is a stagnant river, a scummy creek's dammed pool.
Echo, Toby, Bags, and Raincoat--and, later, Eric Random, Wadada, and various roadies--serve Young's narrative as a scummy chorus of gargoyles, notable mainly for their unpleasant personal habits and childish obsessions.
One parent told me I didn't look like I'd sleep with a scummy drug user," says Hodgins, who had practiced safer sex for several years before she tested.
Jones was a guest speaker at a FUSO Talks event about leadership last July, during which he also refers to 'the scummy Irish' after Joe Schmidt's men ended his 100% record as England boss four months earlier.
COMEDY Birmingham Comedy Festival The 10-day festival continues, with tomorrow's line-up including Phill Jupitus (Old Rep Theatre), The Scummy Mummies (pictured, Sutton Coldfield Town Hall) and Spamalot (New Alexandra Theatre) among others.
The water turns foamy or scummy, with a pea-green, blue-green or brownish-red coloring.
Danny Moran, 21, was routinely called "scummy boy, scummy lad" and "b***d" by Lynette Crook and Rita Page, who were supposed to be looking after him.
Mostly, I blame Cameron 'I've got a confession, I don't like sugar' Diaz and her nauseating nonsense about how we should 'break up with sugar immediately', as if it were a scummy boyfriend.
The study's results were stomach-churning - it found dirty toilets, scummy showers, mouldy bathrooms, stained mattresses riddled with pubic hairs and even infectious bacteria," he revealed.
Why is there never anybody on these shows that went to my Cardiff comp, or drank in my scummy student dives?
Do you think I should become vigilante figure, a dark knight, patrolling the streets to fend off the scummy menace of anti-social behaviour?