what doe sit mean?

[lameduck]

way down to my stomach

[Quizmonster]

The oesophagus, at a purely practical level. This is the gullet, the passage via the throat through which food travels from the mouth to the stomach.

If the question is meant figuratively, it might imply the same sort of idea as exists in the phrase 'a gut feeling'. For example, someone might say: "I feel, way down to my stomach, that something is wrong here."