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a code used among teens to define a girl's butt in reference to the 3 dimensions on a graph. Z axis is how much it sticks out. Y axis is how tall it is. X axis is how wide it is.
Z axis by SMDWCE3 January 28, 2009

The positive z-axis. 

The correct answer to the question "What's up?"

In 3-dimensional Cartesian terms, the x-axis is east and west, the y-axis is north and south, and the z-axis is up and down. So the positive z-axis is what's up.
Guy 1: "What's up, man?"
Guy 2: "The positive z-axis."
Guy 1: *rolls eyes*
The positive z-axis. by MarshoT December 1, 2009

<.7.9.7.6.>Malcolm <`'`Z`~`a`'`Xis`~`>RIght In The Middle The In Left Malcolm Is Down In The <`'`X`~`Axis>Middle<`'`Y`~`A`xis`'`> To Be Up In The Middle<.7.9.7.6.> 

<.7.9.7.6.>Malcolm <`'`Z`~`a`'`Xis`~`>RIght In The Middle The In Left Malcolm Is Down In The <`'`X`~`Axis>Middle<`'`Y`~`A`xis`'`> To Be Up In The Middle<.7.9.7.6.>
<.7.9.7.6.>Malcolm <`'`Z`~`a`'`Xis`~`>RIght In The Middle The In Left Malcolm Is Down In The <`'`X`~`Axis>Middle<`'`Y`~`A`xis`'`> To Be Up In The Middle<.7.9.7.6.>