A sexual position that is explained in the example.
A "Black Thomas" is a sexual position where the male rests the underside of his knee-joint on the female's shoulder, kneeling down on the other knee (or standing up, depending on height of participants). The female is seated cross-legged, and preforms oral sex until the moment before the male reaches orgasm.
It is crucial that the male not reach orgasm!
When the female stops preforming oral sex, the male lifts his other leg over the female's opposite shoulder and quickly teabags the female in the face.