This is not Shay Thomas. Shay was a dishwater blode, short/heavy set, and no tattoos. Shay was in porn from 1991-1996, and this video was shot in 2001. Look up "Shay Thomas" on Xham and you'll see many vids I've posted of Shay. Shay was in another Wild Bill Video, but credited there as "Mrs. Wide Ass"... different name, different woman.
The real name of "Mrs. Big Ass" remains a mystery. The porn creator, Bill himself, has this video available at Clips 4 Sale, under his store "Will Bill Video" Mrs. Big Ass video is available in four parts, and Bill lists the production date as Feb 16, 2001. Nowhere does he give her any name, aside from "Mrs. Big Ass". I would contend that she was a lady who was 'local talent' only, albeit amazing talent, as her mature, luscious body is built just how I'd order one from the factory!