In other words your book was rejected just by the way you asked if they would look at it. 
What it means is that his query letter evinced no skill or talent in the eyes of whomever read it. Since we're talking about a DUmmy here, the query letter was probably chock-full of spelling, grammatical, and punctuation errors. It was also probably passive-aggressive in the rsmithnumbers tradition of formal letters, and I am more than sure that the content of the supposed novel
was of no interest. Agents won't represent a sci-fi novel that's basically Star Wars, with Bush's face pasted over Darth Vader's, and I will hazard a small guess that intergalactic heroes like the
one who likely appears in Tobin's book
do not wear overalls. I will give full marks to Tobin for telling the truth, that he was quickly told to pound sand right up his butt. Cordell spent at least two years lying to DU about his imminent rise to Hollywood
stardom, when in fact he is devoid of skill and is inarticulate, to boot. Now, if Cordell and Tobin combined their powers, why, you might have a couple of pages worth of material for an outdated
Archie and Jughead comic. Watch out, literary world...the overall-clad, lazy-eyed juggernaut is coming for YOU.