Someone would think it has a greater meaning or some thought behind it. The opposite is true. Its literally just loot of Blu Ladz. Da Blu Pile is a large heap of weapons, several trinkets, armor, even just basic materials (for example sticks) that Boyz really really liked.
To somehow protect their treasure, they stored it in the middle of circular stone structure, which are simply just several huge jagged boulders in a circle. Hey, it just works. Who would like to steal something in the middle of Ironjawz settlement anyway...
Around this stack of things is several tents, chunks of fabric or just "comfortable" dents, where Blu Ladz stay, when they want to rest.
Da Blu Pile is shared by everybody from Blu Ladz, but there is still one unspoken rule, that whoever picked it first and is available to defend it, thats the owner. This leads to constant infighting between members, which only makes them stronger.