I think the joke is thhat somme people’s piss smells surprisingly like apple juice . SO a substitute for what this idiot kid did is to take half of an apple and place them iinside each corner of the house. That way you can substitute the piss everywhere by letting the apple halves rots and apple halves makes the house also smell like apple juice? If thats what theyre talking about ? then lol

If not? Im not entirely sure.