The story
Originating from the subreddit r/wunkus, created to showcase memes and images of the kind described below. The subreddit's creator invented the word apparently at random, though the -us in the word likely implies the word is in part a pseudo-Latinism, supported by the plural form resembling the nominative plural of second-declension nouns.
Etymology from Wiktionary, CC BY-SA 4.0.