A large, scary tooth that pertrudes from ones gums and tries to latch on to anothers. They are super contagious so if anybody with a snarltooth tries to kiss you run away as fast as you can screaming "SNARLTOOTH" as to alert others.
Lord of the Rings characters, Disney employees, Dragons, etc. "Look at that snarltooth on that Flik's employee!!! RUN!!!"