look up any word, like turnt:
 
1.
One of the most perfect sizes for a girl's breasts.
'I prefer slender A cup breasts over big ugly breasts.'
by Kyle Lees January 21, 2006
 
2.
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
 
3.
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
 
4.
A little bit less than a hand full.
"how much pot do you have left?" "I've got an A-cup left."
by zarfog April 15, 2007
 
5.
bra size for people who want to think that they have boobs but really don't. in reality they are flat chested.
girl one: i went out bra shopping today,got myself a 32b.
girl two: omg i'm jel i'm only an a-cup..
girl one: (slowly backs away)
by hatingonyouu... July 11, 2013
 
6.
The smallest cup size for a woman's breast, the actual size of the breast does not usually exceed the size of the nipple. They are nice because they won't sag as you get older or give you stretch marks, but bad because people will make fun of you for being flat and you might not get as many boyfriends.
Dick: "Michelle's pretty, but she only has an a cup."
Regina: "That's because she's a ballerina!"
by thisismealex February 11, 2008