Americ-inja
An american Ninja.
a)A retired ninja it is a well known fact that all ninja's retire to america.
b)A fat ninja, normally too lazy to do normal ninja activities,  eg ninja rape.
Alex: you retired! get away from me you evil americ-inja
Joel: i would get away from you, but i'm retired, so all i can do is watch opera and walk around moaning about the taxes.