An interstellar object that passed through the solar system, used as a metaphor for a test run or data gathering mission related to bot activity on the subreddit.
"This was a test run or a data gathering mission, like Oumuamua passing through our solar system, for the return of the astorturfing bots on their larger mission to destroy/compromise the sub 9-10 months later during this election year's summer of happenings."