She has full breasts and always has lovely cleavage.
If you're plentiful and full, you could say you're plump or full figured... in other words, you're not a snack, you're the Whole. Damn. Meal.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.