best mistake 

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! ;)

best mistake by Magic awesome banana painters February 8, 2015

Best 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!"

Best Mistake by _TooruOikawaFavoriteFoodIsMilk December 17, 2021

Best worst mistake 

When you do not regret a mistake you made because it was fun

Dating that girl was my best worst mistake.

Best worst mistake by Shea butter0928 October 6, 2019

besttmistakee 

alexa (besttmistakee) is a twitter fan account. she’s the biggest rat ever and also the #1 best mistake stan. uses cat emojis in EVERY SINGLE SENTENCE

“did you see besttmistakee’s twitter account? yea she’s a rat but i love her!! 😸”

besttmistakee by ntltina / gwstina October 12, 2020