a guy who has a large penis and knows how to use it. drives the ladies crazy and knows just what to say. Always there to listen to people no matter what the situation. often has an obsession with the store formally known as "wa wa" or in other words 711.
Girl: I slept with him last night, he's such a thomas!
Most often a white man with a very large penis ranging from 6.5 - 8.5 inches. While the individual may or may not realize it he is such a stud that women and a few men find him to be irresistible and would do thing for and with him they normally wouldn't do. While a Thomas may be a nice guy on the outside they are a freakin' stud in bed and drive women wild.
When I walked in on Thomas in the bathroom I never knew a white boy could be so huge!