From Alice in wonderland. I have a shirt that says this. It means that when you're curious about something, you dig in & get even more curious about it.
"Curiosor and curiosor" is a wordplay on a phrase from Lewis Carroll's "Alice's Adventures in Wonderland." The original phrase is "Curiouser and curiouser," which Alice exclaims as she encounters strange things in Wonderland. The phrase has come to represent increasing curiosity or interest in something odd or unusual.