Rorikon means pedophile (Which is also known as "lolicon".).
The word "Rorikon" isn't English, it's Japanese, this is how it looks written in Japanese : ロリコン (You won't be able to see it, unless you have installed the Asian language pack)
If you don't know what a pedophile is : "Pedophile persons can feel an attraction to children of a different sex, to children of the same sex, or both."
Short for "Lolita Complex" in a pairing. The "lolita" is always female, and the other member of the pairing is always older than the "lolita." The lolita is generallyunderage.