The utmost mutually favored outcome/solution to an existing
system or scenario which equally adheres to the preferences and favored
benefits of all considered parties in a given
collective.
Bob had a fish and needed a thimble.
Chad had a toothpick and needed a fish.
Ray had a thimble and needed a toothpick.
They all met together for a surpleasant trade.
or
Jess likes ice cream, and doesn't mind
cake.
Jill likes
cake, and doesn't mind ice cream.
Both Jess and Jill each have 1/2 of a whole coupon for an Ice Cream Cake; how surpleasant!