US Marine Corps "Y.U.T." hoodie, what do you think it means?

The Marines have a common saying "Yut!" which is yelled in various situation and has gained a reputation for a motivational response. However, there isn't consensus on what it actually means, is it an acronym or just a grunt?

This sweatshirt is a blend of comfort and style, designed with a classic fit and a soft, midweight fleece construction.

• Crafted from an 8.5 oz/yd², 80/20 ring-spun cotton/polyester blend fleece with a 100% cotton face for solid and camo colors.
• Heather, safety, and neon colors are made from a 55/45 cotton/polyester blend.
• Features a jersey lined hood and a pouch pocket for convenience.
• Enhanced durability with split-stitched double-needle sewing on all seams.