You can wish your male friend a happy birthday by sending him a heartfelt message or card, giving him a thoughtful gift, or planning a special celebration or outing to commemorate the occasion. You can also express your appreciation for his friendship and let him know how much he means to you. Additionally, you can send him a birthday wish through a phone call, text message, or social media post. The most important thing is to show him that you care and want to make his birthday a memorable and special day.