Green’s Dictionary of Slang

scag-nasty n.

also skag-nasty
[? var. on shag-nasty at shag v.1 ]

(UK juv.) an unpleasant person.

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OnLine Dict. of Playground Sl. 🌐 skag-nasty, scag-nasty n. some one doing something disgusting or mean ‘don’t be such a skag-nasty’.