Luis Suarez
A Luis Suarez is a massively feared animal with buck teeth so sharp it could puncture a tyre with the tiniest of touchest. It will bite if approached.
Example:
Nerd: If you are not nice to me I will be a Luis Suarez.
Bully: Ok, take my money, I will be nice to you!
Nerd: If you are not nice to me I will be a Luis Suarez.
Bully: Ok, take my money, I will be nice to you!