When you do something or you don't want them but I don't want you so your the best mistake. I didn't want you before but now I do and it also mean you did something you regret and now you don't regret it anymore
Dang!! Gurl you da best mistake I ever had! ;)
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When you do not regret a mistake you made because it was fun
Dating that girl was my best worst mistake.
A fan fiction of Oikawa and Iwaizumi, that will tear your heart in two. Make you cry for hours on end. Also after reading it, the song (specifically the piano version of it) A Thousand Years by Christian Perry will make you cry every time you hear it.
"Hey! Have you read the fanfic Best Mistake?"
"Ack! Don't remind me of that, I cried for days on end because of that fic!"