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Sexual Partners For Life - Someone that you take a vow with to be sexual partners for life, and know everything about them, no matter how long it has been since the last time you have communicated.
Erin: HAPPY BIRTHDAY!
Kyle: My birthday is in August, I was only joking on Facebook
Erin: Oh, sorry
Kyle: We are no longer SPFL's because you don't know anything about me anymore.
by whoopsyouscrewedup May 16, 2011
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