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1.
A phrase often quoted by Food Network Star Rachael Ray to describe something that tastes or looks delicious.
Just look at those seared scallops. Yum-O!
by Noah J December 27, 2006
 
2.
yummy, delicious, etcetera, An expression of joy in the food/pastry one person is eating.
I want a hoho,and cake, and food!!!yumo!
by billygoat99 March 10, 2007
 
3.
Receiving a load from your man when role playing as Rachel Ray and saying that it's yum-o
When John blew his load in my mouth last night it was so yum-o!
by Assalvanian Vice-President December 09, 2010