What does "asdf" mean? I wonder if it's an expletive.

[Xyzse]

2. Like Nraleighliberal mentioned.

I tend to do the same thing, especially when I am just filling up space to type something.

Any how, it is the first four letters in the middle portion of regular QWERTY keyboard on the left hand side. If you are typing with all of your fingers except for the left thumb, it is the easiest thing to type as you flourish your fingers.

Kinda like how you hit four keys on a piano.

If you have an AZERTY keyboard, the letters would be qsdf...

The first time I tried an AZERTY keyboard, I was confused as f-ck. I almost cussed out the IMF guy that had it.