Green’s Dictionary of Slang

left in place, i.e. of a person, abandoned; of a vehicle, parked.

2011

J.J. Connolly Viva La Madness 46: Morty spent his early life being the hungry kid, plotted up outside the boozer [...] waiting on the alkie mother. [Ibid.] 48: Roy would have different motors plotted up outside different tube stations.