The "cum toilet" here is likely a metaphorical term, referring to a situation where someone ejaculates on or inside of something, possibly in a hurried or impulsive manner. The description uses sexual slang and vulgar language to convey a sense of urgency or lack of control. The phrase "decidedly shot" implies that the act was carried out without much thought or restraint. Overall, it describes a moment of sexual intimacy that is characterized by a lack of inhibition.