Green’s Dictionary of Slang

grid n.2

[SE grid]

1. the human face [? the teeth form a grid or grating].

[UK]K. Sampson Outlaws (ms.) 47: It’s not often that you get the time to give your grid a proper fucking scrape.
[UK]N. Griffiths Stump 61: She’s seen ar fuckin grids now, hasn’t she? [...] Knows what we fuckin look like.

2. (US) the rows of dialling buttons on a modern telephone.

[US]G. Pelecanos Shame the Devil 82: He [...] dropped thirty cents into the slot, and punched some numbers into the grid.

In derivatives

off-grid (adv.)

beyond respectable society, outside the usual records, identification, databases, etc.

[US]T. Pluck Boy from County Hell 71: Chopper’s folks lived off-grid.
[UK]‘Aidan Truhen’ Seven Demons 155: [Y]ou can go off-grid here [i.e. Switzerland] if you want to but you never have to.

In phrases

off the grid (adj.)

1. (US) illicit.

[US]S.M. Jones August Snow [ebook] ‘What better way to protect big-ass pallets of off-the-grid cash than to move offshore onshore?’.

2. outside the mainstream, counter-cultural.

[US]D. Winslow ‘Paradise’ in Broken 232: [A]anything, green alternative, off the grid, crunchy granola—that’s for Ben.