Nuttypants 

to be nude to a great degree or be exposed, in your undies or undergarment.

"i saw jin run down the street in her nuttypants on a dare!."

Nuttypants by Exploding jello January 23, 2010

Johnny Nastypants 

Gender-specific description of a dirty person. Exemplified by those unmotivated to avoid becoming so or escaping from.

Look at that Johnny Nastypants takin' a dump in that overflowing porta potty.

Johnny Nastypants by zedebsky June 15, 2004