Fine, I have to clear that up then XD
(For the people who don't know what is like to have Peachy fun)
Meanings to have Peachy fun:
1) To have fun which is resembling a peach, especially in color or texture.
2) To have splendid (fine) fun
3) To have fun fun with Peach's style what means that
a) everything is pink, giggly, pretty, sparkling, energetic and lovely and all other things what can remind you of Peach
b) Satoshi is included
c) both
4) That everybody do things that Peach mostly enjoys to do like listing things, thinking that if person A knows that person B knows that A knows that B knows that A knows that B knows that A knows and person C knows that A knows that person B knows that A knows that B knows that A knows that B knows that A knows that C knows and both A and B knows that, so which one is the most knowing or Satoshi or other things like that.
5) To make something of peaches like peach jam or peach pie or peach cake (then having Peachy fun is a pun)
6) Satoshi (read the parts 3c and 4)
7) More Satoshi (read the parts 3c, 4, 6 and 7 which is this one)
Even though all alternations are (more or less) presumable (once again more or less) I think that Peachy fun is just random phrase which is used to bring more interesting nuance to our everyday convo about subject called "It's nice to have fun" (which BTW started my innocent annotation that I wanna *whistles*Ash). Once again I can only agree with your comment that "It is always good to have fun" since I'm really amused and happy now~ XD