Danielle Steel must work those glutes, because she's got some seriously hot buns of steel!
by NiraMillson September 13, 2016
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1. having a very tight rear end
2. having a butt that is so tight and toned, it is compared to steel
Tyler- Check out Lydian's behind, buns of steel, man!

Kelsea- Yeah dude...yeahhh...
by Lydian Beck April 08, 2008
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