Jonah Hill's Apology on 'Tonight Show' -- I'm an Idiot, Kids [VIDEO] |

Jonah Hill got seriously choked up while making his second public apology for blurting out a homophobic slur at a photographer -- and called himself a role model ... for what NOT to do.

Hill was on "The Tonight Show" when he brought up the video we posted Tuesday -- Jonah yelling to the photog, "Suck my d***, you f*****."

Hill was emotional about using a word he calls "grotesque."

He also addressed the LGBTQ community directly, and begged young people to ignore the example he'd set -- "Don't respond with hatred or anger because you're just adding more ugliness to the world."