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rule
(pawb.social)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
It's part of a general joke about appending -ussy to more and more nonsensical things, implying that one is viewing this thing in a sexual context. Turning to a friend after watching Godzilla and saying 'yeah I'd love to get some of that Godzussy' is immediately funny. The pizussy is just another example of that.