A diddler of kids. A person who specifically diddlers small children, be it boy or girl. Also often known as a chester (child molester) or a chikiddler. A child kididdler. There are many levels of diddling.
Fry: oh my god look at that kididdler!
John: he's diddling that kid so hard! He's all sweaty!
Fry: he looks like he could use a moist towelette.
A convicted pedophile who dresses as a clown and works at mcdonalds because likes little boys and touches them furiously and sexually 24/7, also has a habit of putting his tiny dick in other people's mcflurry and has a pubic hair that is shaped like a afro hair.
Disclaimer no children was harassed in the writing of this definition of Matty D (AKA Kid fiddler) who by says fiddle me deez nutz