nahni
A person so tough they could fight a bear with one hand while eating a taco with the other and still laugh at your bad jokes.
I said I'd take on the whole school. He said 'nahni' and then took on the whole school and won.
She walked into a fire and said 'nahni' to the flames. The flames said 'what?'.
He was dared to eat a whole pizza in one bite. He did it and said 'nahni' to the dare.