I don't have coding tattoos. I don't have any tattoos. However, I think, if I put a tattoo on my skin, it should be there for decoration. I want to feel good wearing it and I must be sure that I like it so much that I keep it for the rest of my life.
Personally, I don't think that a coding tattoo could invoke that kind of feeling for me. The only development kind of tattoos I could come up with are coding-jokes or the name of some framework. Jokes get old. Frameworks fall. I know people who put band names on their arms, but the bands disbanded or chose to change their style, and those people regret getting that name tattooed.
If I ever chose to get a tattoo, it would probably be a decorative pattern. Something which is nice to show off and gives me energy when I think about me wearing it. Something, which cannot fade or change. Maybe a pentagram.