Thick, cheesy buildup collects around the head of an uncut dick, usually shown smeared under the foreskin or as crusty flakes during a close-up. The vibe leans dirty and humiliating, with characters reacting to the stink, taste, and mess during oral or while jerking it off. Some pages play it for nasty fetish detail, while others use it as a gross-out moment before the dick gets cleaned or goes straight back into fucking.