An action, job or creation which has been completed to a very high standard, and can claim to be "text book" in it's end result.
"Wow, did you see how quickly they did that pitstop? That was bookage."
"The plumber did an absolutely bookage job in installing my boiler the other day"
A woman breasts - specifically when referring to the type, style, size or quirkiness of her breasts. Usually used in a positive way to define "the girls" in question.
Her boobage was such that it couldn't be tamed even with an industrial strength Fredrick's of Hollywood bra.
or
What little boobage she had was choice.
or
My boobage is just going to rebel against the buttons on this blouse!