what does fo stand for in just tell me when they fo shit i have the facebook commected with it i can always go in and change stuff 😂

In that sentence, “fo” most likely means “f k off”** — a blunt way of telling someone to go away or stop bothering them. Given the rest of the message, that meaning fits better than the milder slang uses of “fo” like “freaking out” or “for”.

Why that fit is strongest

The phrase “just tell me when they fo shit” sounds like the speaker is asking for a heads-up when someone starts acting rude or hostile, and “fo” is commonly used as a clipped version of “f**k off” in that kind of context. The mention of Facebook being connected to it doesn’t change the meaning; it just sounds like they’re talking about being able to edit things later.

Other meanings

“FO” can also mean “freaking out” or “for” in some online/slang contexts, but those meanings don’t really match this sentence. In casual texting, context matters a lot, and here the rude insult meaning is the best fit.

Clean translation

A plain-English version would be:

“Just tell me when they start acting up; I’ve got Facebook connected to it, so I can go in and change stuff later.”

That reading keeps the tone and intent without the slang.