When a mormon man stacks his wives on top of each other and has sex with them at the same time. Exiting and entering them in sequential order.
John: Dude, did you hear about Marvin?
Jim: No way, what's up with Marvin?
John: He totally
rocked the salt lake stacker with like 12 chicks. It was crazy.
Marvin: I AM ROCKING THE SALT LAKE STACKER WITH LIKE 12 CHICKS!!!! NICE!!!!