Short for "best friends".

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.

A word that means best friends. Is usually said by teenage girls who are insecure about themselves and therefore calls everyone they come in contact with a "besty." She will generally comment "besties," on every picture of herself with someone else tagged on facebook.

The word is pronounced "best-ees". It rhymes with testies.

the coolest friends in the whole wide world

Naiya and Aaliyah

the people you can trust that are always there for you when you need them the most

a retarded way to say best friends only loser preppy girls use. DONT SAY IT