When you're messed up on an illeagle substance, more than likely an "upper", and you keep looking out the window out of paranoia.
"Dude, quit playing window ninja over there. Why can't you just get high with us and be chill?"
by phatkhiken February 23, 2008
1 more definition
peeping tom, someone who looks into windows for nude women.
tom goes up to a womans window pulls a window ninja.
by Charles Denton January 08, 2008