“Ittekimasu” is typically used by a Japanese when they are about to leave somewhere, mainly from home or the office. The closest literal translation would be “I’ll go and I’ll come back” but a more natural translation would be “see you later” (or “I’ll be back!” as the Terminator would say).
At this moment I am ready to leave for my trip to South Africa. It is going to be a loooooong day. 1 bus, 1 train trip, 2 tube rides, another train and finally an aeroplane. I do not look forward to it at all as there is a lot of hanging around too. At any rate, I doubt if I will be doing any updating here till I get back, but you never know.
So, your next Japanese word to learn is…