Fertilize the Fertilizer
The act of ejaculating into the toilet after you've finished making a #2, either as a type of kink, or because you didn't feel like flushing it first.
Guy 1: "Hey bro, I'm gonna go fertilize the fertilizer 'cause I'm too horny to bother flushing my shit first!"
Guy 2: "Too much info bro, but alright!"
Guy 2: "Too much info bro, but alright!"