Edson, "Curvy" here refers to a woman's body. It means having curves that are pleasing to the eye. "I get curvy sometimes" probably means that she gains weight sometimes and this makes her more round or "curvy". "bootylicious" is a combination of "booty + delicious" "booty" is slang for the derriere or backside of a woman. I think that you can probably figure out the rest by yourself. Denis

From the net: With her band Destiny's Child, Beyonce had a huge hit with the song Bootylicious and the word has been used to describe her ever since. "I hate that word at times," she joked. "But it's fine. It was a song that I never took seriously anyway and I'm just happy that at 21 years old I invented a word that's in the dictionary." The singer is soon to launch a clothing range for women with Beyonce-sized bottoms. She said: "I have curves and my clothes will definitely fit women with curves."