This is when a guy masturbates upside down and cums on his own face. Often licking up the remaining cum.

When you eat dirt for the first time and leave your family to build a shack in the woods

The girl is upside down with her head hanging off the bed/couch and she is giving the boy a blowjob. When he cums she keeps it in her mouth and proceeds to spray it all over his body, hence the topping on the cake.