Basically breasts. Used by most normal
people, unless they are trying to be all clean and say
boobs. If a girl has a nice pair of them, they will be more successul usually, especially in combination with a big ass.
They surround this page, in the form of the tshirt sites' advertisement. Those girls have WONDERFUL ones.
It can also mean a certain type of bird, however these are mentioned less now because of the above
definition.