After utterly failing with a girl, to end up banging / dating / marrying her younger sister. The coolness of the act depends, of course, on the younger sister's relative hotness to the older's.
Most men agree that to pull a Mozart on Kourtney Kardashian would be a decided step up. On Kim, though, it would be a definite step down.
ayon kay BGMan ika-15 ng Oktubre, 2009