This often rage-inducing saying is typically preceded by a blatantly honest statement that's likely to insult at least one person with it's cold, bitter truth. Frequent usage of this saying can spread it's use like a highly aggressive plague, eventually saturating almost all conversations, particularly on the Internet where anonymity encourages impolite truths.
Erin: Dude, this game is mad hard.
Jay: If you just had a lobotomy it might be. Just sayin'.
Erin: ... I hate you so much right now.
Jay: Look, I'm just sayin' that-
Erin: DIE IN A FIRE!
by THE Jaylew March 5, 2010
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Pointing out some information or fact without stating any particular opinion about it, leaving the other person to form their own opinion based on what you've said. The equivalent of the old phrase, "I am just giving information here."
Tom: "Check out this article about alien experiments at Area 51."
Betsy: "The dude who wrote that article also says Elvis lives in his basement. Just sayin'."
by GigiLaFleur August 9, 2017
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“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
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As a phrase it is used to emphasize a point, conclude a statement, or to generally annoy. This phrase was coined and is frequently used by members of Open Mind, a popular MySpace Group.
There are some funny people in that group. Just sayin'.
by Countess Mercedes October 4, 2007
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The act of completely shattering somone's idea and then blatently covering it up with words.
John: Dude we could go bungie jumping!
Mark: How bout no, just sayin
by hkhkhkhkhkhkh December 8, 2010
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The punctuation dumb people put at the end of an unsolicited, baseless assertion to indicate self satisfaction at having stated something they erroneously believe to be clever, biting, and insightful.

Also extremely passive aggressive DAD!
"Twelve doctors told me that I'm wrong, but I don't care. Because I'm a MOTHER, and I KNOW my baby is allergic to peanuts, carbon, municipal water, and the color orange. Don't listen to doctors- they don't know more than you. Just sayin'."
by HCoS JC June 19, 2016
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Something that people said a lot during the mid 2010s when trying to relay the obviousness of a point, often with a snide, flippant, or factieous tone or attitude. As of 2020, the only people still using such a dated term are basic bros and housewives who shop for their evening apparel and their husbands' professional wear at Target.
"4.0 started in 2017 just sayin'! New area of music that year!"
by harmoniousjen September 13, 2020
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