What is Thepenisinhermouth?
1.
Similar to 
PersonA: thepenisinhermouth
PersonB: Ew what? You're gross, go away.
OR:
PersonA: thepenisinhermouth
PersonB: Why is the pen in her mouth?
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1. 
When a cat is lying around with all of their paws under their body and their tail wrapped around their side, so their body and head are ..