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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 12, 2004
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