Primarily black and hispanic communities' slang (USA)
Moving drugs or other illegal goods from one place to another i.e. drug running, gun running
has evolved to just "running" to explain the concept in the USA.
Also see That run
NB Got these definitions in a youtube vid with filming in "the ghetto" in and saw I had to add them! It's the urban dictionary after all, I wish people weren't allowed to add so much nonsense posting.
TJ: Yo was up girl, wot happenin' with you AJ? You look a little nervous.
AJ: Running
TJ: Damn, you running? I heard you was holding 10k of weed for a rainy day. Aight
AJ: Aight, word