Possible Clues:

• Big dos
• Picked dos
• Some big dos
• Some big 'dos
• Some natural 'dos
• Big dos, for short
• They were picked by Questlove and Jimi Hendrix, among others
• Bushy dos, informally
• Hairdos that are hard to wear hats with, familiarly
• 'Dos you don't want to sit behind at movies