It's a phrase you use towards someone when you want to stress a point that, although not really important, still bears mentioning. It's almost like when people say or write "just saying" at the end of a comment.
A girl throws a drink in your friend's face...

Friend: "I can't believe that bitch did that to me!"
You: "Not for nothing, but you were acting like an ass."

Friend: "I can't believe that bitch did that to me!"
You: "Well, you were acting like an ass. Just saying."
by not for nothing August 18, 2014
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means that you are into something without any doubts, any objections or anything with/on you.
No nothing on u while in bed with someone. Sleeping of course.
by Friedl October 14, 2009
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Means something but your most likely to lazy to explain.
"Whatcha doin?"
"Nothing"(your actually eating but you realize that "nothing" is easier to type than "I'm eating"
by MrsPiggyMuppetLove May 15, 2016
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Steve: What goes faster than the speed of light?
*Mr. Tweetums lands on Steve's shoulder*
Carl: Nothing goes faster than the speed of light.
*Mr. Tweetums suddenly dies from inhaling some nothing*
Carl: How did Mr. Tweetums die?
*Carl suddenly dies from inhaling some nothing*
Steve: Exactly! But when did this nothing appear?
*Eric suddenly dies from inhaling some nothing*
*Allison suddenly dies from inhaling some nothing*
*Steve dies from a heart attack*
by edggya June 22, 2009
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You. Everything you do/have done/will do.
"Speak to me Sarah. What's wrong now?"

"Nothing."
by CartledgeB2 October 27, 2003
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"Something" Everyone Seems To Be Doing Everytime You Ask What They Are Doing.

Makes People Very Mad.

Very Annoying When They Ask For Something To Talk About.
Caution: Nothing Might Make Someone Have Nothing To Talk About.

Greg: Hey Ashley What Are You Doing??
Ashley: Nothing...

10 Minutes Pass...

Ashley: Why Do You Never Have Anything To Talk About...?
Greg: ...Why Are You Always Doing Nothing...?
by .Tit.For.Tat. March 30, 2008
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