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1.
Something you add to a statement when you know that it really isn't needless to say.
I went to my seven-year-old nephew's birthday party last night. Needless to say, I got wasted.
by Your mother.. June 15, 2010
 
2.
An unnecessary and somewhat obnoxious introduction to an obvious observation.
Synonymous with the phrase “it goes without saying.”
Person A: I heard that my teacher’s vagina smells like a toxic waste dump. Needless to say I won’t be putting my nose anywhere near that.

Person B: If it’s needless to say, then why did you say it?

Person A: Well…I…uh…I don’t know.

Person B: Dick (while walking away).
by Wite Vagina Finda January 19, 2010