It means that mountains of dead leaves (or autumn leaves) are piling up. The reflexive verb points to the fact that the leaves themselves are piling up and 'a la pelle' points to the quantity - hence me saying 'mountains' of dead leaves. Conveying quantity in a more poetic way than 'mountains' would be a better match for the context of the song but I haven't come up with one yet!
Klo
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