A proper multi-use bit of Brit slang. To nick something is to steal it, usually something quick and cheeky. The nick is the police station, and if you’re in the nick you’ve been banged up. Then there’s in good nick, meaning something’s in decent condition. Same word, three lives, so listen for the context.
"Someone’s nicked my bike outside the offie and I’m fuming. My mate goes, You did lock it, yeah? I go, Nah."