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One who steps lightly on the floor in a second/third story apartment.

One who sneaks into the neighbor's apartment through the patio door.
1. Dude, I had to be an "apartment ninja" just to go to the bathroom becuase the old lady downstairs likes to yell at me for noises...

2. Dude I think I just got owned by an "Apartment Ninja" because that's the third time my internet was on when I came home.
by !Z3D! July 11, 2008
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Free apartment locating company serving Houston, Fort Worth, Dallas, San Antonio and Austin, Texas. Clients get $150 rebate

once they lease.
Apartment Ninja Apartment Ninjas
by ApartmentNINJAS June 10, 2009
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