- when the cumshot or money shot is done inside the pussy or ass, and the cum is allowed to drip out.
creampies are sometimes related to impregnation sites, and sometimes to cuckold sites (making the slut wife pregnant or at least putting her at that risk). Many sites also blur the line be having "on the pussy" or "on the asshole" cumshots finishes, that while not specifically an internal cumshot, does represent a cum covered pussy or ass, many people consider these also to be creampie finishes. Creampies are a common fantasy often found in erotic stories.
Site specific to the creampie niche include Creampie Angels.