Backseat-typer
A person that likes to sit behind somebody that is typeing on a computer and tell them what to type and how to type stuff. Pointing out errors and anything else.
"You missed a word there." "You forgot to capitalize that word." "You mispelled that word." "OMG THERE IS A RED SQUIGGLY!!! *gasp*"This is what a a backseat-typer is.