When your partner fills their anus with fluid and you proceed to use your penis as a plunger to get the fluid out of their rectum.

"When I come up your chimney"

Sex position where both people are upside down in a confined space (like a chimney) with at least one person in a onesie of some kind

When your Druncle sits on your lap. When he finally gets up, you’re going to have a warm and moist lap.