The dipping of a scrotum into another's mouth and demanding that they repeatedly say "Daddy O" with a 5 second emphasis on "O."
After a long day at work wouldn't you just like to come home and ask the Mrs. to perform for your pleasure a Dirty Daddy O?
by Gottalaughatthat December 17, 2009
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The nickname given to the best roommate possible. Exhibits several traits of a straight up G. Likes long walks on the beach and getting all the girls. Basically the guys everyone wants to be friends with.
"Dude I heard your roommate bought for everyone last night."

"Yeah he's a total O-Daddy."
by stanfordman84 March 30, 2010
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