1. (n.) jocular slang for a top notch person who is likely to rattle the cage wherever he sets foot, usually extremely creative and whatnot in his field of expertise.
Example: He is a real snotyoung. He can create anything he sets his mind to.
2. (a.) really, really young
Example: Yo momma is milfin' it like a boss, dude. Her toyboy is snotyoung!
Note: snotyoung is a typical Dunglish word derived from the Dutch word 'snotjong(en)': a kid one considers to be a menace to society. It is also the name of a creative bunch of storytellers in the Netherlands, best known for its exceptionally strong skills in the field of photography, filmmaking and writing.