I didn't actually know what steemit it was, fully, when I signed up; I didn't know what I was going to use it for either. I thought it was going to be more like a reddit, where users want to be more Anon, but it turns out steemit is way more community driven. However, I had already chosen my name by then.
I have been living in South Korea for awhile, teaching English. Well, one of the idle groups, Twice, came with a song, TT - "Im like TT~" Anyway, I tried to explain to my students, that TT stands for Todd (my real name) Teacher. So, I'm like Todd Teacher. HA. They didn't believe me of course.
When I signed up, I wanted something more Anon, and also had the song stuck in my head, so thats what I ended up using.