One who provides explanation or cautionary advice, often with pleasure or smugness, which is initially seen seen as a downer or negative, but upon further reflection by the recipient is realized to be frustratingly logical.
I found a pill under the bed in my hotel room. I looked it up and it was a pain killer narcotic. When I asked my friend if I should take it, she ruined all the fun by pointing out the risk of ingesting a pill of unknown origin. What a logicunt!
by StylePolice September 11, 2019