You ain't shit 

= You're nothing.
However, 'you ain't shit' isn't necessarily an insult. You can comfort someone by saying that they are not shit.
You ain't shit vs. You are shit is definitely not the same. 'Ain't' is a general negation vernacular term.

FuckBoy : I cheated on my girlfriend and I don't even feel guilty haha
GoodMan : Really? You ain't shit, dude! (insult)

You ain't shit by SNBX June 27, 2016

You ain’t shit 

Meaning agu ain’t shit

Example agostina lamas ain’t shit

Girl: hey kid can you pass that!
Boy:no get it yourself

Girl: you know you really ain’t shit

Boy: what does that mean

Boys Best friends: she means your being an agu a person that ain’t shit

Example2 : you ain’t shit means your being an agu
When you don’t wanna do certain things for a person when they ask you for so help cause your lazyyyy asfff

You ain’t shit by Patricia is da shittt January 23, 2020

You ain’t shit 

Meaning: Agu

Example: agostina lamas ain’t shit

Girl: hey can you pass me that!
Boy: no, get it yourself !
Girl: you ain’t shit nigga

Boy: yo what does that even mean

Boys homeboy : it means your being an agu

Boy: oh no wtf

You ain’t shit by Patricia is da shittt January 24, 2020

you ain't the future of shit 

You will not be important in the future and you are not important now. So stop complaining.

Whiner: Man, they really need to pay me more at work.

Aaron: Man, YOU AIN'T THE FUTURE OF SHIT! Stop bitchin'

you ain't the future of shit by theworldisforked February 26, 2020

You ain't shittin' kittens 

Indicates strong agreement to a comment made by someone else, especially when that persons comment is a bit of an understatement, or states the glaringly obvious, or both.

Effectively equivalent to the phrase "That ain't no lie!!" or "Ain't that the truth?!", but said with great enthusiasm.

During a heavy thunderstorm, your friend says "It's a little bit wet outside." You respond with "You ain't shittin' kittens!!"

Two retail employees get done dealing with a difficult customer. In private, one says to the other "That guy was a douche!" The second responds with "Pfff, you ain't shittin' kittens!!"

You ain't shittin' kittens by Atavist December 14, 2010

you aint shit

you just trashy,ain't nothing but a bum,creep,loser,coward,waste,etc
or someone who can't do nothin,but eating,playing and sleeping

A:godamn it,you always mess everything up
B:sorry man,but i aint mean to....
A:shut the fuck up,don't explain,you aint shit!

you aint shit by Emagician September 4, 2005

you aint shit

you really suck at a sport or game or anything you do

Daquan: you let him beat you 25-0

michael: shut up

Daquan: no you shut up ... YOU AINT SHIT !

you aint shit by SwaggedUp November 20, 2009