"ktgdd" is most likely a random combination of letters with no clear meaning. However, if you meant to type something else, here are some possible suggestions for correction: "kitten", "forgot", "gadget", "tagged", "kiddo" or "garden".
KiddKidd is one of the most popular nicknames used for basketball player Jason Kidd.
KTD
TDDTDD, which stands for Test Driven Development, is a software development approach that focuses on writing automated tests before writing the actual code.
TGD
ToddTodd is a skilled graphic designer and has won awards for his work.