Contrary to, forbidden, or not authorized by law, especially criminal law.
This is illegal, you know!
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Forbidden by established rules.
Nearly 40 million people live in UK areas with illegal air pollution
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(philately, of an issue printed for collectors) Totally fictitious, and often issued on behalf of a non-existent territory or country.
Their illegal mining operations in Asia, Africa and elsewhere, are protected by officials and police paid to look the other way – and powerful customers in the construction industry who prefer not to ask too many questions.
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Add your own interpretation of "illegal".
Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.