Abnormally Bulbous Nipples. A genetic syndrome that can often affect people who are under alot of stress as well. One telltale sign of this obscure occurance is when nipple-lumps can still be seen, despite the wearing of a bra.
ABN makes little more than curious embarassment for most people, but it's a gift from the gods for fashion models.
by Dylan Hewson August 09, 2005
A.B.N means Assholes By Nature, created by the rap artist Trae. A.B.N is featured in many of his songs. A.B.N is not a bad thing to be, when your bitch acts up just go abn on her ass.
"yea, matt and nich are a.b.n, they are assholes to everyone"
by Matt Matt Matt Matt Matt Matt April 09, 2008