Do NOT overeat. Try lunges, they will build the muscles in your but and make it look bigger. If you wanna gain weight but not fat, try strebgth building exercises and a diet with more protein. This will make it easier to build muscle so you will be a bit bigger without getting fatter. (If you just wanna get fatter, invest in Twinkies ;-P)

Do squats, leg presses, and lunges. Also, you should eat healthy foods.

I'll leave a link to an article that will explain how to get a bigger butt and toned stomach.

I hope this helps…

Your butt isnt flat
You have an hourglass shape- you're just slim with it. You can tell coz you look like an S from the side and an 8 from the front
If some fat chick said you look like a boy, SHE. IS. JEALOUS.
what's your bmi?
17-21 is the ideal range (not health wise, but ideal for guys- how they prefer their girls)

Just do crunches for your stomach and start running. You'd be surprised what it can do for your abs. Running on an incline will lift your butt, but you cant make it bigger unless you gain weight

With your frame it wouldn't be hard to achieve results.

For the abs, lie on your back and put your legs together. While lying lift your legs together and raise them *slowly* into the air until they're at a 90 degree angle with your body. You'll start feeling the burn in your abs after about 4 or 5 leg lifts.

The only way to make your butt bigger w/o putting on weight is to tone the muscles. Walking or jogging is a great start. It won't only tone the legs but all the muscles in your body.

cornbread or do butt toning exercises so your butt isn't flabby but firm

You could always use optical illusions to make your butt LOOK bigger such as flap pocket jeans.

http://www.denimblog.com/wp-content/uplo...

anal sex

Build muscle. You can actually make your butt rounder and larger by altering the appearance of the muscles in it (Gluteus maximus, Gluteus medius, and Gluteus minimus).

?The ultimate butt expanding exercise is the full squat. It not only can dramatically increase the size of your butt, but it will also improve the shape of your legs, giving a more proportioned appearance. It must be done properly, though, or else you can injure your back: How to Do a Squat

2.Adjust your weight. Whether you should gain weight or lose weight in order to make your butt bigger (relative to the rest of your body) depends on your natural body type, which is controlled by genetics. When you gain weight, where does the fat go first?

?If it tends to go to the butt and hip area, gaining a little weight will help fill things out. See How to Gain Weight.
?If fat goes to your arms, stomach, or back first, losing some weight will make your body more petite in relation to your butt, which makes your butt look bigger. Read How to Lose Weight. This is especially true if you carry extra weight on your waistline. Getting a smaller waist can make your butt look bigger, even if it didn't change a bit. See How to Lose Belly Fat.
3.
Choose the right clothing. Shop carefully and find clothes, especially jeans, that are cut in such a way to emphasize your buttocks. Usually they contain spandex in the blend so that the denim "hugs" your butt, supporting it and emphasizing its distinction from the thighs. The waistline should be snug, and as low as it can go without creating a muffin top or showing a plumber's crack. You can also purchase undergarments that "shape" your butt (but that won't help much if you wear baggy jeans over them).
4.
Stick your butt out. Arch your back, take a deep breath, and throw your shoulders back. This will not only make your butt more prominent, but it'll also slim your torso a bit and make your chest look bigger. In addition, sticking your butt out when you're walking is essential for good posture, strengthening your core muscles as they fully support your spine.[2] Be sure not too stick your butt out too far and over-arch your back, though, since this can lead to back problems.

To further emphasize your curves with a feminine swagger, follow the steps in How to Walk Like a Diva.
?
This advice applies to men, as well. The first high heels.