A strong and complex nonsexual relationship between two or more females that is greater than being BFF. Similar to a bromance.
If Jennifer Aniston and Courteney Cox weren't strait I would swear they were lesbians. I guess they are just breasties.
by Lipsmackinggood December 12, 2012
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A best friend of yours that has the same breast size as you
Kim: Hey look, it's my breastie Emma. Let's go say hi!

Mark: Breastie?

Kim: yeah, she's my bestie and has the the same breast size as me.

Mark: let's forget we ever had this conversation

Kim: Agreed
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The accurate term for girls who are best friends.
Jenny: Chelsea, its okay if you want to cancel our plans this weekend so you can to the concert with Lea and Jill instead. I'll understand.

Chelsea: Jenny, are you serious? Pshh, girl fuck them. You're my breastie for life, our plans come first :)

Jenny: Aww, we're total breasties! :)
by Its funny girl! Nyan-ja~ June 21, 2014
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I went to the Flattie’s Ball with my breasties!
by Lsears July 27, 2020
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two female friends that have attractive breasts, and are comfortable enough to take a bath with each other, change in front of each other, and when photographed, usually will pose close enough for their breasts to smush against each other. ( derived from besties )
Joe: You know Megan and April have been getting close to each other, lately.

Mac: Yeah I know, have you seen Megan's profile pic?

Joe: The one with both of them in it?

Mac: Uh-hun, they are such breasties.
by handsomevirgil November 8, 2009
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Being in the mood for breasts. Partially horny, but mainly just the need to look at breasts. See also "Assy" and "Pre-Party"
"I've had about 3 beers, i'm in a really breasty mood"

"Hey Kelly, show your tits! I'm feeling breasty!"
by Deus April 11, 2005
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