What is Upside Down Pineapple Cake?
1.
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.
Boy1: dude, why are you all sticky?
Boy2: girlfriend tried something new, the upside down pineapple cake!
Boy1: you need to end that relationship asap.
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