Top definition
Something awesome (especially something unexpected or surprising) that makes your life easier or in some way better; a declaration of love.

Also, part of a childhood playground threat.
Wow! I had no idea that accurately graphing parabolas could be so easy! This TI-83 is my new best friend!

Alice, I can't believe you did that! Wow! You're my new best friend!

That was SO much fun! Rock climbing is my new best friend!

You didn't pick me first for your kickball team yesterday. I hate you now. But that's okay. Sally is my NEW best friend.
by Lady Chevalier May 23, 2005
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