Green’s Dictionary of Slang

shopping n.2

[ironic use of SE]

1. (US Und.) shoplifting.

[UK]J. Cameron Vinnie Got Blown Away 34: ‘Did some lifting, you know.’ Bit of shopping.

2. (US prison) looking for something to steal.

[US]Bentley & Corbett Prison Sl. 33: Shopping Looking for something to steal.