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Friends who have each other's backs, look out for each other, spend lots of time together, and are just really good friends.
They have inside jokes together, they go to the park and swing on swing sets, get ice cream, go to the beach, go to concerts, go bowling, and basically any activity that they like doing together as friends.
1. Kaely and Xander are besties!

2. Kaely: Yesterday, I went to the park and played on the swings with Xander!
Sam: Well of course! You're besties!
besties by meeoww1234 August 16, 2009

Besties gc 

The best Twitter group chat. We fight trumpies and find ourselves sugar daddies to buy us Louis merch
What’s the best group chat on Twitter?

It’s Besties gc! Duh!
Besties gc by wifeofcalumhood November 15, 2020

Ultimate Super Awesome Mega Besties 

When you are more than besties and will always be there for each other. You laugh at each others super lame jokes all the time! Ultimate Super awesome mega besties usually don't know how they became friends, they just upgraded from stranger to Ultimate Super Awesome Mega Besties
John: We are friends right?
Lisa: Of course! no im wrong
John: So we arent friends?
Lisa: No I meant we were Ultimate Super Awesome Mega Besties
having all desirable elements, qualities, or characteristics; as good as it is possible to be. nothing possibly better
Lucy is the bestest person to come in to my life!
Bestest by This One Guy In Like March 18, 2020

Jungkook Bestest Boy 

The worlds bestest boy. Must protect!
Jungkook bestest boy

osmosis besties 

The process of befriending the best friend(s) of your best friend. Given the mutual common best friend, a relationship can easily be formed with your best friend's said best friend(s).
My best friend's friends came to visit this weekend. I instantly became best friends with them through the process of Osmosis Besties. We are now one group of real life Besties.
osmosis besties by KyFace September 28, 2009