A term commonly used to exemplify the fact that all Thomas-es slightly resemble turtles. Also, it is used to mock young, muscular men who enjoy eating sandwiches, wrestling, and refer to their father's by their first name.
Girl1: Woah..... that guy is such a Thomas the Turtle!!
Girl2: Wow... Tom sure looks like a turtle!!! Soo... that's why they call him Thomas the turtle!