nick off

1. To leave or depart very suddenly, abruptly, or hurriedly, especially without permission. Primarily heard in Australia. She and two other kids had nicked off from school. The man I had asked to cover for me apparently nicked off early, which meant that I got in trouble for leaving the post unattended.

2. To steal or filch something from someone. In this usage, a noun or pronoun can be used between "nick" and "off." Primarily heard in UK. I nicked a cigarette off my roommate and headed outside. Check out this wallet I nicked off a tourist in the city centre.