Top Definition
it is the little bit of underwear, typically boxers, that sticks out the back when the owner, lets call him Justin, of the pants is too stupid to buy the proper size, resulting in the pants being too small. mutanz can be associated with a nickname or can be used to address the actual underwear sticking out.
1: look at the way justin is walking, you can see his mutanz.
2: HEY mutanz, pull your pants up!!
3:mutanz, is a translation from italian, meaning underwear.
by DJLherzing March 10, 2009

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