Green’s Dictionary of Slang

1. (US black) to steal; thus bumped adj., stolen.

1988		M. Munro Patter – Another Blast.
1997		L. Pettiway Workin’ It 110: I was bumping then [...] Sticking people up, snatching people’s pocketbooks.
2000		Other Side of the Wall: Prisoner’s Dict. July 🌐 Bumped: Stolen, also used to indicate someone had gotten into another youth’s room because certain doors can be bumped hard enough to be opened without a key. (Illinois).

2. (Scots teen) to defraud, to steal from.

2020

G. Armstrong Young Team 125: When cunts find oot that there’s nae third party tae potentially enforce [...] the debt, yir mich more likely to git bumped.