lamb rack

a word commonly used by chavs to describes the ass of a girl who they have seen recently.

james ; yo you see murds new bird?

dan ; nah fam, what she look like do?
james ; the usual, blond caked with make up and only wears northy
dan ; anything different?
james ; raa she had the thickest lamb rack id ever seen fam
dan ; yo i gotta see this bird now