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Someone who is the death of a party of social get together. Typically exhibits traits including those of a perriwinkle, piss knuckle and fuck knuckle. The person is generally a black hole that sucks the energy out everyone around them with nonsensical facts that has no basis in reality. They typically talk just to be part of a conversation without adding any value whatsoever. You can spot them by the uncomfortable silence that follows right after they have spoken. A really strong blertus can kill a conversation just by their presence within the general vicinity.
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