The "Daaru Badnam Kardi" beer mug sounds like a fun and catchy concept! Here are some features and details you might consider:

1. Design: The beer mug could feature a sleek and stylish design, perhaps with a black matte finish to give it a classy yet edgy look. Incorporating elements from the popular song "Daaru Badnam Kardi" could include lyrics, musical notes, or a silhouette of the singer.

2. Material: The mug could be made of high-quality glass or stainless steel, ensuring durability and a premium feel.

3. Capacity: Offer the mug in various sizes to accommodate different preferences, such as 16 oz, 20 oz, or even larger sizes for those who like to indulge.

4. Print: Use high-quality printing techniques to ensure that the design is vibrant, long-lasting, and resistant to fading or peeling.

5. Handle: A sturdy handle ensures a comfortable grip while enjoying a cold brew.

6. Packaging: Consider packaging the mug in a themed box or tin, adding to its appeal as a gift item or collector's item.

7. Care Instructions: Include care instructions to ensure the longevity of the mug. It should be dishwasher safe for convenience.

8. Customization: Offer the option for personalization, allowing customers to add their names or special messages to the mug.

9. Licensed Merchandise: Ensure that all designs and branding comply with copyright laws, especially if using lyrics or imagery from the song.

10. Marketing: Utilize social media platforms and targeted advertising to reach fans of the song and those who appreciate unique and themed merchandise.

By incorporating these features and details, the "Daaru Badnam Kardi" beer mug could become a popular and sought-after item among fans of the song and beer enthusiasts alike!