After a guy ejaculates inside a woman’s vagina, despite attempts at cleaning, it can stay present for rough 2-24hrs. During this period, at random (usually an inopportune moment), the warm cum will be discharged. This is kerplopalopin, it could be used as a noun or verb.
When Austin delved into Alycia's jungle of mystic exploration, he discovered that the weeds were to high to trudge through. Therefore, his peepee went kerplop.