Unside-down dead unicorn
When you and your partner get on the top bunk of a bunk bead with rails and the receiving partner assumes doggy style and the delivering partner does a handstand and leans the package into the desired hole while convulsing and making horse noises
"Omg. Becky, kyle and I did the Unside-down dead unicorn last night on the top bunk and it rocked my world"