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When one has only one friend and must rank them as their best friend due to the fact that there are no runners up.
Person 1: Hey man who is your best friend?
Person 2: Bob; he's my best friend by default.
by Keael February 27, 2006
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When someone tells you you're their best friend but you are painfully aware you're their ONLY friend.
Chum: "you're my best friend"
Lee: "yeah! Best default!!"
by Chumbo82 July 17, 2017
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