The scout rush you're referring to is probably Raging Amish's scout rush. It is actually a pretty decent strategy. It involves sending about 7 - 8 scouts to your enemies homeworld. Have the scouts destroy the constructors. While doing this, tech up to 3 military stations and unlock timed explosives for scouts. Meanwhile, you colonize and shit.
Start blowing shit up in your enemies homeworld once you unlock timed explosives. You need to be TEC to do this strategy because they're the only race with this ability. It works very well on small maps. But it can be countered. Fighters can cut through scouts in seconds and a Sova cap ship can embargo your enemy as a counter.
At least, that's how I did it. But I also got lucky, there weren't enough scouts left to finish my frigate factory.