answer: obviously it depends...you are not playing by "official" rules but rather "house" rules so in that case, whatever you decide is what it is, there is no "traditional" or universal definition
even if you were playing games to 5, as official rules require, you could make up your own skun rule
with that said, i have played a fair length of time in a number of places and a skunk has always been 5 to zero...any way you decide, i'm of the opinion that for anything to be an official skunk, whatever the score winning game is to, it requires that the one team score all points and the other team to score ZERO...
zero is skunk..."you got nothin, you stink" skunks stink, thus you got skunked