It's a technique that taught you how to "lift up the Adams apple", but it is the main leading cause for vocal damage and shitty voices. Vocal weight is hard to understand, but the easiest way to explain it is how fast the breath comes out of your throat. Ive been taking singing classes at a vocal coach for awhile, and it's basically a way to soften or thicken your voice. It's very important for a loud, but soft singing.