What will happen if I submit my website to Dmoz second time after several months of waiting and not hearing anything from them ? Will they ban my site or will they just decline the submission ? Thanks ...
Not precisely 'cancel out'. A new submission of the same site to the same category will overwrite the first submission, so it will have the later date on it. So any editor who looks through reviewed in date order will take longer to get to it. In short - resubmission doesn't help.