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1.
Japanese for Grandpa. Not to be confused with Ojisan, which means Uncle.
My Ojiisan sends me money for my birthday.
My Ojisan sends me paperclips.
by Spazmatik Illusion January 17, 2006
 
2.
Also used in Japanese to refer affectionately to any old man.
Excuse me, Ojiisan, does that whale meat taste nice?
by Fred12345 March 23, 2010