When you're watching a japanese porno and the guy finishes inside her pussy. Usually the guy inserts his grubby fingers into her pussy and tries to scoop out the non-existing cum
E.g For the a couple attempting conception/procreation the male will release his sperm (the 'cream') into the female's vagina during climax/orgasm thus releasing his cream into the 'pie.' When withdrawing his penis typically some of his seed will drool/ooze out of the vagina, giving the creampie after-look.
Female - 'He came so much inside me it felt like it was drooling out forever... The perfect creampie!'
When you give a girl a creampie (or your the one who got the creampie) and instead of cleaning up she puts her clothes on and leaves for the day without draining it from her pussy.
When she gets home you check if it’s still there and if it’s still there let it stay and if it’s not then you can go at it again. ;)
Harley: “I am doing a Creampie Walk right now Katie and I’m so horny right now.”
Katie: “Is it really that good? Maybe I’ll try it with Tom later.”