Patty, it's not just your blonde condition, there aren't clear comments on this and others have been confused also.
See
Double Mahoi question about second+ generations
Joe also posted comments from Jon's site further down in this thread
Double Mahoi pups real bargain.
I've assumed that it means that the refers to a pup that is the second generation of a mat and that these plants are stronger with bigger root systems, etc. If pups are dug up and transplanted, they're first generations. I figure any other interpretation would mean that every plant we're growing is a 500th generation or so, right?
But then there was this post last year where even some neglected pups performed in a very unusual manner!
Quadruple Mahoi