What is uncut sheet laminated flooring?

Never heard of anythying by that name. Kinda sounds like you are mixing some terms you heard.

Uncut Sheet flooring would be 12' wide Vinyl roll goodswhich are not actually laminated but printed.

Laminate (Laminated) flooring is rigid and usually about 8" wide & 3-4' long and clicks together. It is made in the same process as an old formica countertop, laminated to a dimensionaly stable backerboard so you can install it as flooring.