No.
Lifting slowly puts your msucle fibres into overdrive. It forces them to work harder the slower you lift because they're working harder to procude what is needed to give you enough to make the actual lift. When you lift slowly, your fibres work harder, which produces greater strength, with greater size gains.
There's also a point where your muscles are weakest, forcing your fibres also to work harder. This is on the reverse way to your lift (i.e pushups - on the way back down, bicep curls - on the way down as well and not hte curl upwards). Lifting weights slower produces greater gains than lifting fast.
Lifting fast, can both damage your muscle as well as only really tone's. Wheras slower lifts, produce all three. Gain, Strength, and toning.
The only thing I can think of that you may be referring to is a "POWER SET". But those are done where you lift one weight as many as you can, and then drop 5 pounds and go lift as many on that weight as you can, and continue down a few more pounds consecutively.