back jump
n.— «One way of getting to tag trains was a method called doing a “back jump.” This when you hide near a station or lay up, wait til a train pulls in, then quickly do as much painting as you can before the train rolls out again. It’s quite dangerous as it in- volves crossing tracks and being around moving trains. There was a kid killed last year at Acton doing this sort of thing.» —“Blood on the tracks” by Esther Addley Guardian (United Kingdom) Jan. 20, 2007. (source: Double-Tongued Dictionary)
Further reading
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When there’s no evening meal planned at home, what do you call that scramble to cobble together your own dinner? Some people apply acronyms like YOYO — “you’re on your own” — or CORN, for “Clean Out your Refrigerator...