Wett™ is a brand of water-based personal lubricant. It comes in a big blue bottle, which has a handgrip molded into it. Wett is remarkably slick, takes a while to dry out, and is flavorless.
Also, a little dab will do ya.
Available at fine adult shops everywhere.
It has nothing to do with RATT, besides having the unnecesarrily redundant extra "T".