A Shadowbunny is a virtual machine (VM) instance that is deployed on a compromised host to provide an adversary persistence and at the same time evade detections. The VM itself does not have any security monitoring and is entirely attacker controlled.
The selective promotion of a user on a web platform without the public being aware of it. It takes the form of unrestrained, covert, and artificial advancement of an individual over others in order to give them an unfair advantage. It involves advancing posts, profiles, opinions, videos, streams and other content from that individual to much larger than average and underinformed audiences without their knowledge or consent. It's harmful in that it's underhanded, subversive, manipulative and diverts public opinion from truths.
<half-asleep guy>: Why is my feed so full of statistical and moral falsehoods?
<awake guy>: Don't you know? It's one of countless examples of thousands of years of shadowboosting.
Banning a user from a web forum in such a way that the banned user is unaware of the ban. Usually takes the form of showing that user's posts/profile/etc. only to that user; other users never see them. Considered underhanded chicken-shit behavior.