You're nicked

Please could you tell me where the phrase "you're nicked" comes from?

It is, I think, a variant on the theme of 'you're pinched' or 'copped'.

'Nicked' also being slang for 'stolen' or 'taken'.

DFG

Does it mean "arrested", "jailed" or just trapped in a difficult situation (for example, when one obediently follows the orders of the superiors and a s result finds oneself in a difficult situation abandoned by those superiors on one's own)?

It means arrested, especially in London (at the hands of the Metropolitan Police), though it is now pretty much universal in the UK.

DFG

Thank you.