What is Volcanic Threesome?
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A threesome whose sexual escapades are both incredibly hot, and spews what, inside the metaphor, would be refered to as "magma".
A volcanic threesome is if you were to be involved in intercourse with Karen O and Nick Zinner at the same time.
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Random Words:
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Derivation: U.S. Navy slang. An entreaty used by a desperately horny male sailor to get another male sailor to engage in clandestine sex..