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Originating 1970s from Tilbury Docks Essex, from the old timber ships (the timber was called "green" cargo and if you dropped a pack of it, you would have an aching back after you picked it up! - Knocking over of cargo/accident resulting in the picking up of somthing heavy.
Forklift driver knocks over a stack of pallets - "Bills just had a green acher!"
by secret-squirrel September 17, 2009
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