A medical term for when a man or woman (usually a man) begins to grows large breasts and the nipple begins to expand to resemble a pancake. In some cases the nipple can start to blend into the skin or even become disfigured or discoloured.
Not to be confused with the puff marshmallow effect.
Dude, Steve took his shirt off the other day and his nipples were pencayked. That fat cunt needs to stop eating.