The belief that the death / destruction of something can be attributed to you masturbating to that item.This can be applied to masturbation that results in the termination of that Object by accident, or masturbation with the intent to kill ( malicious masturbation)

Example of a Fapsassination:I once fapped to the idea of having sex with one of my moms really hot friends before going to sleep Woke up the next morning to find out she'd killed herself that night...that was something that nobody I know will ever find out about.-Reddit user TyperSniper