The term "cum-jerk" is a slang term used in the adult content industry, specifically in the context of porn videos. It is a combination of two words: "cum," which refers to the male ejaculation, and "jerk," which refers to the act of masturbation.
In this case, "cum-jerk" is essentially describing a scene or video where a male character is jerking off (masturbating) and cumming. This tag is typically used for videos that focus on solo male masturbation and ejaculation.