A pixie undercut is a hairstyle that combines a short pixie cut with an undercut, where the sides and back of the head are shaved or buzzed very short or completely shaved. This creates a bold and edgy look that is both feminine and modern. The longer hair on top can be styled in various ways, such as spiked up, slicked back, or left tousled for a more textured look. Overall, the pixie undercut is a versatile and daring hairstyle that can be customized to suit individual preferences and personalities.