Don't shit in the sandbox 

Full phrase being "Don't shit in the sandbox just because you dug a big hole"
In reference to children attempting to dig to china in their sandboxes, the moral of the phrase is that you shouldn't stop trying hard just because you've achieved /something/. For example, just because you've graduated and you have a steady job and you're doing fine doesn't mean you shouldn't go to college and aim for a degree. It's constantly striving to be better that bring people the greatest of success.

Also - just don't shit in the sandbox, that's just rude.

Kathleen: "You know I've been working at this damn office for 5 years, no promotion, no new faces. I think I'm gonna call it quits."

Jessica: "Don't shit in the sandbox just yet! I hear your boss Roger is getting ready to fire that bitch of an assistant he has, and I'm pretty sure you're next in line!"

Kathleen: "Shit in the...what? What is that even supposed to mean?"

Jessica: "I don't know...my grandpa used to say it all the time."

Don't shit in the sandbox by Janice Booterman January 31, 2010

Don't shit your g-string 

A way of telling someone to calm down, or not go crazy.

"So what the Lakers lost, dont shit your g-string about it."

Don't shit your g-string by B-Rash aka "Every Time" December 28, 2003

Toxic t-shirts from primary school 

Oversized t-shirts that people who eat lay's chips tend to wear.

-Hey, are you wearing Toxic t-shirts from primary school.
-Yeah, suddenly i feel like stealing my mother's credit card and buying gems in clash royale.

Toxic t-shirts from primary school by Dobi oli Free April 4, 2023

don’t shit where you sleep 

A saying that basically means, don’t fuck up in a place you have to be around, examples include school, work or your home

“That guy sold dope out of his mom’s house and his parents called the cops on him. I guess this is a reminder, don’t shit where you sleep at.”

don’t shit where you sleep by George N. May 2, 2025

Don't shit where you eat

Do not cause trouble in a place where you must be on a regular basis. Often used with workplace romances but can also apply to relationships with students at your school or starting shit in general.

Kyle tried to ask Jennifer out. I told him don't shit where you eat.

Don't shit where you eat by A1988 February 16, 2020

I don't shit a fuck 

From Cyanide and Happiness, this rendition of 'I don't give a fuck' is made more epic shit. Used when you want to really show someone you don't even give a flying fuck what they think.

A: I got a new phone
B: Shut up
A: It's twice as-
B: I don't shit a fuck!
A: But the processor
B: NOOOOOOOOOOOOOOOOOOOOOOO

I don't shit a fuck by Ceastra September 19, 2014

Ain't shit 

Describing one as if they are nothing

And_You_Hype on Twitter ain't shit.

Ain't shit by IAintShit_Yet May 22, 2016