What does getting perfect'd mean?


Today I played (on ranked matches) against a usual run of the mill Sagat who was pretty good, we were at about 50% win rate against each other. After a few matches joining my game every chance he got, he won with a perfect on the last round, and then he just got up and left. Yes I was a little disgusted at my incompetence, and we did not exchange messages after that but I felt him leaving after scoring a perfect was “See, you are pathetic, you just got perfect’d, and now it’s going to remain at that”. Or am I just getting overly sensitive about this?