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 16, 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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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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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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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"
by canufuckanostril March 5, 2018
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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.
by Chr1sDalt0n October 22, 2020
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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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