A contraction of "submitter" and "retard" with an obvious meaning. Used mostly on social bookmarking sites like reddit or digg where retards are submitting stuff.
An error you probably get on your example that makes you want to fucking kill yourself. Oh and by the way, I GOT IT AS I WAS TYPING THE EXAMPLE UNDER THIS!
Person 1: Oh you got that message too, huh?
Person 2: That whole "There were 1 error that prohibited this form from being submitted?" Message? Yeah. Unfortunately.
someone with about half the mental power of a person with down syndrome, someone that can't see their stupidity when it's pointed out to them, a dim bulb in slow motion, a mental midget