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1.
a person who appears to be totally carefree, etc etc, but is actually really sweet and caring and all the things a girl wishes for.
my boyfriend doesn't even compare to a rishu.
by LifeRocksWithYou August 03, 2011
 
2.
To be delicious. Asians say "derishious", so this has been shortened to just "rishus".
"mmmmmmmm... This sandwich is rishus"
by waziAkrim February 18, 2014