Whump

By embracing dark genres of slash such as ‘squick’ and ‘whump’, the art of mythagowood purposely skirts parameters of taste and acceptability.

Source: wiktionary

Narrative devices shared by Hannibal and fanfiction include “whump,” the vivid abuse and torture of a character, a popular convention across certain types of fanfiction: Graham is knocked out, shot, stabbed, gutted, sawed open, and subjected to induced seizures.

Source: wiktionary

However, further research with a larger sample and encompassing more fandoms would be necessary to confirm this potential explanation of this trend and to explore the impact of other factors, such as assigning characters a physical and/or mental disability or illness for the purpose of whump or hurt/comfort stories.

Source: wiktionary

[…] the sound of sheets drying on a line a windy day: whumping, whushing.

Source: wiktionary