Ah yeah, it's a little annoying because the "help" command doesn't tell you what the parameters actually are...
The meteor (and movePlayer) command take an X and Y tile-location for where to strike. Like this:> meteor 505 505
If you turn on the debug overlay (command "debuginfo"), your current tile coordinate is the "pos: x, y" line. You'll start a new game around position x 500, y 500.
The meteor command just drops a single meteor, and they don't actually destroy/do anything when they hit. Still gotta work on that!