"saying" = I'm just saying, or an agreement.
That's one defintion, yeah, but it's important for our foreign friend to know that the idiomatic usage around here can also be roughly equivalent to "I'm not disagreeing with/criticizing/making fun of what you're saying, merely presenting objective facts that call it into question," with the "saying" functioning as a kind of "air shrug," a stand-in for "Hey, those are the facts--it's out of my hands." For example:
"Yo, this is some straight street shit, thun!
Maaaad undergrount!"
"Eh, I don't know--they were playing tracks off that over the P.A. while I was trying on therapeutic mandals at Aldi. Saying."
At the same time, it's important to note that this is also very often used to say, in effect, "I very much
am disagreeing with/criticizing/making fun of what you're saying, but I wish to dress my opinion in a veneer of objective facts so as not to seem like too much of a prick." For example:
"Yo, this my
favorite record, duke!"
"Yeah, I liked that one, too...then I hit puberty. Just saying."
The distinction is subtle, but important.
...
Also, "holler" should be used judiciously. Some folks use it to mean "talk to" or "call" ("Holler at me later"), while some use it to mean "Try to pick up...
seck-sue-uh-lee." I remember Terry Clizzo running afoul when he innocently posted something about his sister "hollering about" something; dudes popped up like Whac-A-Mole on some "Yo, your sister's tryna
holler?!" So, you know, exercise caution.