From Populous Wiki

Rushing is a common tactic in populous, and can be referred to as brave blasting as well. Many people frown upon it, but others embrace it. Basically, it is sending in your shaman at the very beginning to destroy all the braves causing the opposing team to lose. If you attempt to rush and fail, it handicaps you for the rest of the game.

Rushing can also mean going in very quickly with an Earthquake. This is widely used, and not at all disrespected. Rushing can be a common tactic on Face Off.