a term commonly used when, after being served, you serve them back. once this is done, then ITS ON!
A:you just got served!
B:oh its ON
A:hey hey, its not on!
B:oh you better believe its ON!!
by Simo December 09, 2004

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Top Definition
what you say when the battle/showdown is about to begin, or when you want to fight someone after school.
It's on, mother trucker!
by fizzle April 10, 2004

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1. A term most often used when declaring war.
2. A term used when Something is about to happen.
1. De'Andre: I heard you was talkin bout me...
Leroy: Yeah, I was...You aint gone do nothin bout, so....
De'Andre: Oh I aint...?! Okay...Its On!!

2. Keisha: You goin to the E-40 concert?
Wanda: Yeah girl, Its On and poppin!!!
by Miss LayDee June 20, 2006

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When one male puts his excretion on his penis and rubs the liquid over the tip of his penis to the ballsack and lubricates the genitals thoroughly, the point of masturbation has commenced to which there is no turning back.
As I went on that girls Instagram account and saw all of her nudes, i spit on my dick and started jerking off. I knew it's on and had the most longest masturbation and dry est mouth of my life
by Dsel123 May 08, 2014

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1. use it instead of saying goodbye
2. use it when something's about to happen
Me: hey girl lets go to the club tonight
Friend: okay meet me there
Me: alright, its on * click *

Me: theres a fight!
Friend: oh shxt! i gotta see that.. k its on!
by xoShawty440 July 27, 2009

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a response to someone sayin they are leavin
P1: Ay dude, we up.
P2: Its on.
by Kat R. October 17, 2006

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1. Declaring the state of being "On".

2. A phrase coming from the greatest TV series in the galaxy: "South Park".

3. pneumonoultramicroscopic - silicovolcanoconiosis.
It's on you pig scraping, rectal gut, lolly-gagging, apple husking, sour-dust snorting, tick biting, family guy watching avacado hand roll.

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