If you are looking to replicate this look, you cannot simply ask for a "mullet," or you risk getting the infamous "business in the front, party in the back" bowl cut. Here is the terminology to use with your barber:
Hairstyling Tips with Neymar: Wavy to Straight Looks - TikTok neymar jr mullet haircut
“I need that,” he whispered to his barber, Miguel, that evening. If you are looking to replicate this look,