Top Definition
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.
by fisherich September 15, 2009

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when two girls are friends and lovers
Those two girls are more than friends, they are breast friends!
by $tephanie April 17, 2006

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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
by Hank11234 January 26, 2011

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A female best friend
Jean has been my breastfriend since high school.
by proffessor010 September 07, 2010

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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
by Hank11234 January 26, 2011

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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 30, 2009

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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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