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1.
Phrase used whenever someone says something that's offensive, or hurtful, mean etc. It's is used to automatically erase what was just said, as if the person never said it.
Guy #1:

Ey dog I would love to fuck the shit outta your little sister.

Guy #2: WTF did you just say????

Guy #1: I'm just saying.....

Guy #2: oh ok...kool
by 40 ounce bandit May 15, 2009
 
2.
a phrase you say once you've offended someone but you don't want to say sorry
Bro you smell like ass, I'm just saying
by Treysteroid of Youtube January 14, 2011
 
3.
An alternative to "In My Humble Opinion..."
Its an easy way out to the end of a heated conversation. It also allows you to cover yourself so no one can rebuttal
Boy 1 - People dont do enough work around here. Everyone at this job is lazy!

Boy 2 - Maybe its YOU who doesnt do enough work and maybe YOU are the one who's lazy, I mean, Im just saying.
by Skrillamon March 22, 2011
 
4.
This is a phrase often used when a person is being accused of something or is said to offend someone unknowingly, while stating something.
Sarah: "Your shirt is Purple"
Lyndsay: "No it isn't"
Sarah: "It is Isn't it Alex?"
Alex nods.
Lydsay(frustrated): "Whatever it's not a big deal."
Sarah: "I'm just saying"
by CCWoodson December 03, 2008
 
5.
A phrase used in the movie "Fired Up" by Sylvia (Marg Harshman) who says very weird sayings and right after says "I'm just saying"
Person 1: What does the other team have that we don't have?
Person 2: Better cheering, hair, ass
Sylvia: Big Ass titties
Person 1+2: What?
Sylvia: I'm just saying

Sean: Let's be cocky bitches!
Everyone: Yahh!!
Sylvia: I want to cut the blonde one
Everyone: What?
Sylvia: I'm just saying
by imjustsaying266 November 21, 2009