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.
by gamenut89 August 14, 2008
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Similar to "friends with benefits" except not full "benefits" just copping a feel...
Johnny and Lisa are Breast Friends, its like they are going out... but are not.
by Nou! May 31, 2009
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when a dude is friends with that one girl who has huge boobs.
John: That girl has huge boobs bro.

Tyler: I know, she is my breast friend.
by FiNNy8192 November 10, 2010
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Having a breast friend means to have a girl thats your best friend!
Hannah: OMFG YOUR LIKE MY BREAST FRIEND!!
Lexi: I know rite breast friends 4eva
Hannah: cya later chika
Lexi: Choww
by msnluver January 23, 2009
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This is a similar saying to friends with benefits but emphasizing that at least one party is female.
Susie is one of my breast friends.
by I, Wreckerrr February 5, 2021
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Two girls who are best friends forever, but have breasts (coz they are girls), so become breast friends forever

A girl who is a guy's best friend, is his breast friend
Carla and Sarah are breast friends forever!

Emily is my breast friend!, said Liam
by BruSta November 25, 2018
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A female friend with benefits, who has big (or at least nice) boobs.
She's not my best friend, she's my breast friend.
by q359 July 24, 2023
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