Cum-on-soles is a porn video tag that indicates a specific type of scene or act in the video. In this case, "cum" refers to the male ejaculate, and "soles" refer to the bottom or sole of someone's foot. This tag suggests that the male character in the scene ejaculates on someone else's feet, specifically the soles. It is a fetish-oriented scene and caters to individuals who find this particular act sexually appealing or arousing