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.
the awkward smurf with the afro...sadly, this smurf never made it to the actual show. Samitard the smurf enjoys sitting on stumps in the forrest while devouring roasted peanuts, smoking white-spotted shrooms and biting its nails.