Green’s Dictionary of Slang

(UK Black/drugs) the countryside, in the context of setting up a base for temporary drug-selling.

2015		M. Dargg ‘Upsuh’ 🎵 Yo Rends we're goin upsuh / The kittys they calling they wanting the flake.
2019		Headie One ‘Ball in Peace 🎵 You can't tell me 'bout upsey deliveries, bandos, any excuse for the trap.