Ok kiddo, let's talk about cherty i rezy! Cherty means something is like a rock made out of a mineral called chert. Chert is a type of rock that is often shiny and hard like glass. Rezy means something is resinous. That means it's sticky, like honey or syrup.
So, cherty i rezy just means something that is hard and shiny like a rock made of chert, but also sticky and resinous like honey. It's like if you had a candy that was both hard and chewy at the same time.
Hope that helps!