This is obviously a joke on the old Bugle Boy Jeans brand. Wow, just change the order of two letters, and it makes such a big difference in the meaning.
I wonder if the brand would have sold more jeans with this slight brand name tweak.
Actually, Bulge Boy Jeans could be a new brand claiming to be the Wonderbra of men's jeans: wearing them enhances your bulge to make it look more impressive than it really is.