1. For a woman, a dick in a glass case - use only in case of emergency.

2. For a man, a woman who you haven't fucked yet.
"For a man, a plutonic friend is a woman you was tryin' to fuck, made a wrong turn somewhere, and ended up in the 'friend-zone'. Oh no! I'm in the friend-zone!"--Chris Rock
by 'sup P December 13, 2004
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A distant humanoid or associate that is happy and comfortable in the friend zone despite the nay sayers.
A Plutonic friend is a distant far, far, far away associate or old friend who can enjoying laughing and other things without getting weird.
by adreamdefered94 July 24, 2020
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