Country Dictionary

Your fuck buddy that happens, does not need 2 be female.

Necessities:

Must have breasts

"Yo are y'all together?"
"Na, she just my breast friend"

"Mathiccy, r u fuking Piper"
"Nah, she wont be my breast friend"

"Quincy u know Areeb cant be ur breast friend"
"cmon he got mad titts"

A man's female best friend with no romantic feelings between the two.

Finding himself dateless on a Friday night, Jenkins decided to call his breast friend Leanna to hang out.

Friends with benefits but for lesbians.

Tom: Did you hear about Dana and Katie?
Matt: What do they go out?
Tom: No they're just breast friends.
Matt: Hot

Friends with benefits but for lesbians.

Tom: Did you hear about Dana and Katie?
Matt: What do they go out?
Tom: No they're just breast friends.
Matt: Hot

Your best friend whom also happens to have nice breasts.

Why don't you bring Crystal next time?
She's my breast friend, so I'm perpetually stuck in the friend zone. She'll probably leave with some asshole, after I paid for everything.

when two girls are friends and lovers

Those two girls are more than friends, they are breast friends!

Noun;
The girl in a group of guys that can keep pace with the men and give each of them her opinion and get the dirt on the skanks that they are dating.

Joe: Dude! Julie just told me that this girl that I'm interested in, Lisa, is a total whore!
Tom: That's what you get when Julie is your breast friend.