WORK IN PROGRESS.
About
Walruse refers to an image of a seal, often accompained with the phrase “you’ve been wal-rused”. It’s often used as a form of shitposting.
Origin
It comes from 4chan’s shitposting board [s4s], on late 2013.
Spread
On November 23rd, 2013, a subreddit is dedicated to walruse was created, gaining over 700 suscribers in less than two years.