This joke is a reference to page 829 of Homestuck. Dave Strider, a major character, tries to talk to his friend, Jade Harley. Jade Harley is asleep at this time, so he leaves her some messages. One of these messages is asking her if she's asleep, y/n. He then adds s to it, standing for species. The species is a reference to Jade's love for anthromorphic animals. He begins to ask her what animal she is, saying "if kangeroo rat yiff twice plz"
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