From the
Greek endo for inside, within. Meaning, of course, the same. E is for Endo is a common T-
Shirt worn by cool dudes and galz who like it "inside" rather than
outside.
Example 1 - Dude: I had an infection inside my intestines and they had to give me a gastrointestinal endoscopy. I wasnt so much afraid of the pain but rather that I'd like it.
Example
2 - Girl: Wow, the
guy yesterday really
got endo with me.