Related to plopping, once the penis is inside the foreskin of another penis; the two men, ejaculate, once the semen dries up, it will turn crusty, acting as super glue, thus fusing the peni as one penis.
Person 1: Why are you guys standing so close to each other?
People 2 and 3: We performed cock fusion.
People 2 and 3: We performed cock fusion.
by SizzlingBacon3:16 May 21, 2016