It's a stealthy
way of calling someone a
masochist. if you
read "Osamaru" backwards you get the message "Ur a maso".
Guy 1: Man that
crazy girl abuses me everyday!
Guy 2: Why
won't you break up with her then?
Guy 1: I still like her though.
Guy 2:
Dude I didn't know you were such an osamaru