Biddy Ripping

An activity done on a train in which 2 gang members get a granny between the coaches, and two other gang members go to either end, and drive the two halfs of the trains in opposite directions, thus tearing the granny in half. This activity was

popular on the DLR in London around 1987.

Guy: did you read in the paper? Theres been another biddy ripping.
Guy2: what the fuck are you on about?