Abuse of Yukkuris. Also nicknamed "abyuse".
Abuse differs from violence in that violence is straight out harming or killing of Yukkuris while abuse is typically more creative, more punitive, more sadistic, or done for anon's enjoyment. A lot of misconceptions stem from the confusion regarding both terms. Abuse may be done in the form of violence, but just as all violence isn't due to abuse (like mass exterminations done by hired workers doing their jobs), not all abuse needs to be violent.
Abuse is the polar opposite of family_friendly. As users shouldn't post pro-abuse comments on family friendly works, users also shouldn't post anti-abuse comments on abuse works. Frequently and willfully ignoring that rule can and will potentially result in a BANNING.
Also see bullying for playful abuse that isn't as malicious as the abuse tag implies.