This phrase means "do not have romantic relationships with any co-workers." Basically, you don't want to make yourself uncomfortable (by potentially having a romantic relationship get ugly, or "shitting") at the place where you work ("where you eat").
Dude #1: "damn a really hot blonde just started working at my company. i'm gonna ask her out"
Dude #2: "dude, haven't you heard the saying: Don't shit where you eat?"
by whodey June 16, 2004
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This expression refers to doing anything that would jeopardize something important or essential to you. A common example of shitting where one eats is engaging in a romantic affair with a co-worker, but lying to your roommate or stealing from friends also fits this expression.
Local Bike Shop Mechanic #1: "Can you believe that guy? I've hooked him up dozens of times, but after the tantrum he just threw, I'll never take a dime off a part for him again."

LBS Mechanic #2: "Seriously. Hasn't he ever heard? Don't shit where you eat."
by Tom Cerveaux February 8, 2010
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An uncomplicated question to get people to talk.

It was first used by Marine in the summer of 2003 when he joined one of the elite guilds on Ragnarok Online. The people in the guild did not talk often, and being as talkative as he was, Marine broke the ice by asking everyone a simple question: What did you eat today?

It is a question that is easy to answer and concerns a topic that everyone can relate to (food); the perfect icebreaker.
In the summer of 2004:

Esperine: What did you eat today?
Alynia: I had pizza! o_o
Persona: Chicken D:
Verdande: Mmm.. noodles ;o
by Marine October 8, 2004
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Don't behave in a way, or make choices, that will ruin something you depend on.
Captalist: Let's just dispose of this toxic waste in the nearby river where people fish.

Sane person: Say what ? That's suicide. Don't shit where you eat, my friend.
by Wyrd Sister March 9, 2017
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The infamous Cigarette you smoke after you get done eating a meal, or even a snack.
Ex:

Matt: Let's go have that Cigarette-After-You-Eat-Cigarette!

Preston: I'm already smoking the Cigarette after you smoke your Cigarette-After-You-Eat-Cigarette!
by The Advocates August 14, 2009
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do not scew up or screw someone from where you work and or play.
Joe is screwing sally from work and she is busting his balls all the time while working, just riding his ass all the time. Well, he should know that you "don't shit where you eat"
by oldcoprs1 November 4, 2010
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When a customer comes in with her son and you make references towards having relations with her in front of her son but then rescind the other by using work as an excuse.
Mom: What are you doing later?
Employee: I'm sorry but I subscribe to the methodology of Don't play where you eat.
by Jonrad Scudders September 25, 2008
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