pockets of stones = To put stones in one's pockets means one is going to commit suicide. This term comes from the method of suicide employed by Virginia Woolf when she put a large stone in her pocket and walked into a river to drown herself.
Virginia Woolf died on 28 March 1941 when she drowned herself in the River Ouse near their home in Sussex, by putting rocks in her coat pockets
(please, see in Urban Dictionary)
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