What you will need:
Step 1: Start with second day hair. This look works best with hair that isn't newly dry.
Step 2: Let your hair lay naturally. Then take a comb or your fingers and make a side part that begins at the crown of your head. Pin the part in place if you need to. Then pull the rest of your hair back like you were making a ponytail. Leave some hair laying at the sides to frame your face.
Step 3: Wrap your hair elastic around your collected hair and as your pulling your hair through stop right before if comes completely through. You should have a little blob of hair laying in your elastic.
Step 4: Your last step will be to pin your bun up. Lift the bun up just a little bit and start pinning it from underneath. If you need to use some pins on the side of the bun, that's fine.
This step may take a few tries to get it just the way you want it.
Spray on some hairspray and you're ready to rock your messy bun!