Define It Goin Down Meaning

It's about to happen, something is about to jumpoff; it's happening right now

happening, occuring, the questioning of one's recent actions

to get on your knees and suck cock
the present tense version of went down

After doing your substance of choice, the point of time between the high and the crash at which you've passed the point of no return, and no additional amount of substances will keep you going.
(Responsible partiers take note: it would be wise to NOT WASTE ANY MORE OF YOUR SHIT at this point, recognize it for what it is and call it game over already! You'll only be mad at yourself later, like on Day 3...)

Homosexual innuendo implying a male threesome which includes oral compilation and anal penetration, simultaneously.

Also see. Lucky Pierre

Popularized by the music artist Yung Joc's song, "It's going down."

Wes Hall, fuckin quere

An expression used commonly to refer to a seemingly impending fight or confrontation that will usually result in someone or multiple persons getting the shit beat out of them. Often heard when one person insults another's mother or girlfriend and the man insulted enough is ready to flip.

What you say when you know something big and bad is happening.

What you saw when you know something big and bad is happening.

going down on a man... or a woman