“Just saying” or Just Sayin” in the Midwest is used as a tag on the end of a thought almost always used for comedic effect. Sometimes it is used to indicate you expressed something that should be obvious to everyone but most people are too intimidated or uncomfortable to say out loud (like the elephant in the room metaphor). Depending on context it can also mean “seems obvious to me but it’s obviously just my personal opinion.” Occasionally it is tagged on the end of a sentence to indicate your previously expressed thought or opinion was just a quick first impression or “off the top of my head” response. Context is everything to understand the correct meaning.

In my experience it can be applied equally to a compliment, a criticism and/or as an effective form of sarcasm. Most online definitions for it’s use completely missed the functional meaning of the phrase stating it was used “to claim something as fact without evidence”. Some claimed it was to “soften criticism or defer provoking anger from someone”. The worst was from people claiming it was used by “people with no balls to say something controversial or potentially offensive but to accept no responsibility for saying it.” Another misinterpretation Claimed the user knew their statement was false but were unwilling to acknowledge or respond to any facts proving otherwise”. Personally I have never once heard the phrase used as described in this paragraph.
Example of it being used as a compliment:

A friend of my complimented me on some pictures I had posted on either Instagram or FB. She expressed an opinion that I should consider pursuing photography more diligently with a belief that I could earn some money licensing or selling prints etc. At the end of her complimentary opinion she added the “Just saying” comment.

Example of good natured sarcasm i.e teasing a friend or giving them some friendly grief:

A younger girl/woman you know well wants to wear high heels to an engagement but is obviously struggling to maintain her balance while walking around at home. “Perhaps a nice pair of flats would be a more sensible option.... Just saying....”

You are having a meal with a friend at a restaurant and they spill their beverage on something while drinking or the ice shifts in the glass causing their beverage to spill out on themselves. “Perhaps a straw would be a good idea...Just saying.”

Then there are tons of political and other memes out there with the phrase used for various types of sarcasm.
by Scooter B June 5, 2019
Get the Just sayin mug.
Telling someone some home truths about something and dont want to get into trouble?

Just finish the line with "....Just sayin" as if you are just pointing out the obvious that others wouldn't say.
Tamwa: She should sooo not wear those crazy boots with those jeans, she looks like a fucktard...Just Sayin
by bevo12 June 15, 2009
Get the ...Just Sayin mug.
a question meaning what are you doing or an alternative to wat up? used in a variety of ways as in a form of greeting, and the beginning of totally unrelated questions.
Yo guy whatchu sayin tonight gettin crunk, or working for The Man
by SambucaT May 2, 2006
Get the whatchu sayin mug.
What you use when you are trying to insinuate something and they pick up on it. It's like a get out of free jail card for those moments.

Ashley: Maybe you shouldn't wear that dress.

Lucy: Why not?

Ashley: It doesn't fit right.

Lucy: Are you trying to say I'm fat?

Ashley: I'm not sayin', I'm just sayin'.
by asheebee August 27, 2008
Get the I'm not sayin', I'm just sayin' mug.
yooooo! watchu saying! can't you see.. its my ass!!!

sporty gyal!!! wanna duel?
by Hawk October 19, 2003
Get the Watchu sayin mug.
They mean to say know what I am saying?
Slang: Nome saying fool

American English: Did you understand what I am saying.

Queens English: I say, Do you understand what I have spoken to you?
by Tubugs February 12, 2012
Get the Nome sayin mug.