In India, 420 (In Hindi चार सौ बीस “Char-soo-bees”) refers to a person that breaks the Indian Penal Code Section 420 which deals with cheating and dishonesty. It basically means a trickster or a con man.
“Have you metAnil. He was nice to me.”
“Stay away from him. He is a 420 (Char-soo-bees.)”