A modern slang term coined in Essex. Appearing French in origin it is actually a witty play on the words "rib, "boob" and "on".
1. When the breast of a slim (to thin) girl rests on a hint of rib.
2. Also pronounced (when misunderstood); Boob-on-rib;
When a slim girl has an attractive contrast between the breast and the ribcage.
"Thanks for the bill, and might I mention, that is some fine rib boubonne you have."
"I live for rib boubonne."