When the Anus of a man is rapidly filled with other mens bodily fluids (cum,squirt juice,spit, or a combination) then the receiving man proceeds to tightly clench his arse cheeks together and shake his body, effectively smelting the fluids inside of his arse.
“Hey Ronan, did you see johnnys nephew got an ardoyne smelter!”
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi