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2.
When u land a trick on your skateboard u yell this excitedly.
yea nigga one two,one two yo!
by Arachnaphobia February 17, 2003
 
1.
Inane phrase uttered by many people when testing microphones.
Testing, testing, one two, one two. Yeah I think it's working.
by Lambchops November 24, 2004