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1.
A slang phrase that means "It is no big deal." or anything similar in meaning .
"Sorry it took me so long to return your phone call."

"It ain't no thang."
by IceWarm March 09, 2004
 
2.
Ebonics for "It's nothing"
Ain't no thang but a chicken wang, my game is all that.
by AYB February 20, 2003
 
3.
A Jive word used to replace "I do," often used in court when asked if you swear to tell the truth, the whole truth, and nothing but the truth, so help you God. Usually followed by the speaker slapping the bBble, and then the holder of the Bible using the Bible to slap the speaker's hand. For further definition, see thang, or the movie Airplane II.
"Do you swear to tell the truth, the whole truth, and nothing but the truth, so help you God?"

"Ain't no thang."
by Yunaresuka March 01, 2004