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The smallest measurement defining the size of one's chest size; neither objectively better or worse than larger breasts. The derogatory term "flat-chested" is considered synonymous to it. Often times disregarded as beneficial due to its disbenefits, despite the plethora of advantageous properties it has. Typically not seen in an even light with larger breast sizes.

Long story short, smaller breasts can satisfy almost all needs larger ones can, and it works the same vice-versa. For example, smaller breasts can be played with and so can larger breasts. However, smaller breasts allow closer interactions while larger breasts get in the way. There are also, obviously, things smaller breasts cannot satisfy and larger breasts can. One of those things include a titjob, a kind of foreplay that involves the use of one's cleavage (and the rest of the chest's soft cushions) to jack someone off.

In any case, those with larger breasts suffer quite a lot on a physical level. Those with smaller breasts suffer quite a lot on an emotional level. Either way, both should be equal.

Please, be kind.

It isn't nice to weigh the scales unevenly.
Girl 1: "I may only have an A-Cup, but it makes life a lot easier. I don't have to worry about the back-pain or stairs. There won't be shirts I don't fit anymore, jackets I can't zip all the way or button-ups I can't button up. I don't have to buy tons of bras, and won't have trouble seeing over my bussom. I just wonder what it would be like to have them bigger. I can't help myself. Mine are just so small! It makes me feel so inferior to look at other girls and see that they have bigger ones than I do."
Girl 2: "I understand, I'm not that much bigger than you. Mine are C-Cups. Sure, I'll look around and see girls with larger ones than mine, but at least I won't have nearly as much trouble. If I can take care of mine well, they won't sag much like people think. Of course, I still experience a lot of the issues you said you won't have to go through. You're lucky to have small breasts. The only real benefit of larger breasts I can think of is to just make you feel sexy."
Girl 1: "I get you. I honestly don't know why it matter so much to me, either. I know the pros and cons of smaller breasts. The thought of having bigger ones is just so compelling."
Girl 2: "I guess? Don't change yourself to make yourself more, quote on quote, attractive. Lots of people think A-Cups are cute or sexy, anyway. If your chest size matters on whether or not you get into a relationship, you probably shouldn't get into it."
Girl 1: "Yeah, yeah.."

The conversation goes on and on.
by Viaspo May 20, 2019
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2
A drinking utensil that holds liquids not breasts Haha fucking dumb fucks!!!!
I used a cup to drink some water.

#Fightmeforacup!!!!
by #rere August 11, 2018
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3
The smallest bra size. Most often think it's bad to have an a cup but it's actually better. When you're in your 30's+ your boobs won't sag whereas bustier girls will.
Jane- haha you have an a cup while I'm a c cup hashtag #flat

(A few years later)
Jane- I'm only 28 and my boobs already sag... You're so lucky because they're small and cute and don't sag. boobs small boobs pretty lucky itty bitty titty comity
by Missbitch485 September 18, 2016
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5
The breast cup size which is of measurement A. Girls may be made fun of being "flat-chested" but actually they are the best-looking tits. Perfectly fits in your hands and very cute when you cum on them.
Friend: Dude, looks like Megan has a cup. Haha, stupid flat-chested bitch.

Me: Actually, I had her in bed with me last night. She had great tits. Small, but cute.

Friend: Wait, what? Hook me up.

Me: No.
by JesterHatz November 10, 2008
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6
Breasts that aren't filled with silicone. They look just as good at 50 as they do at 20. B and C cups might be nice, but A's are the best.
I wish my girlfriend had a-cups!
by ABND November 02, 2005
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