To strike a enemy on the chin with two fingers, letting him know you don't respect him. Often concidered the worst insult that can be givin in the hood. Almost worst that getting your chain snatched
How it's done:
Lift both the index and middle finger 18" above the head and swing down swiftly striking him/her from the jaw to the chin, while maintaining eye contact. End with an insult or a challenge to retalliate.
Daymn! He chin checked dat fool!
Yo, he size me one more time I'm gonna have to chin check him!