'50s version of what dude is now. Today it is barely known and lies almost completely forgotten amongst all the other odd words thought up, used and then thrown away and only used by weird people that can't let go.
Guy 1: He's beep-boppin' and skatin' and I'm loosing it!!!

Guy 2: Stay cool daddio.
by Drake November 13, 2005
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Daddio a legendary mythological last name of a small group of individuals with an origin from Santa Maria Vica,Italy. Once these individuals leave this area they gain super Human powers similar to that of Super Man after leaving his home planet. They are also known for there incredible hottness and charm.
WOW. Who is that hot guy walking down the Street that must be Daddio.
by Dad-dio December 16, 2005
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Person trying to be the coolest human alive but screws any and everyone over to get there. Uses people as tools to make oneself appear cooler than they are. Term only used with respect by children who don't know the truth of a Daddios true character.
That daddio would be nothing but a loser if they didn't have people they could manipulate, use and step on. At least daddios kids don't know what daddio has done or they wouldn't respect that POS daddio either.
(Least daddio has them fooled... For now)
by Chocolatebutter March 7, 2014
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a pompous jackass who is completely and totally self involved
Wow, look at that daddio he's a total prick.
by bball133333 February 13, 2006
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Is a term to describe a large female clitoris. A clitoris that resembles a small penis rather than a clitoris. A "daddio" is a typical feature of female body builders who have low body fat an increased levels of testosterone.
I saw this girl in a movies and she has this big daddio clit!!
by Allaboutgq November 13, 2011
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Commonly a word with no definition, and can practically be used in any tense. It can be used to express anger, happiness, or even frustration. The origin of the word is unknown, but the word is quite fascinating. You can use this word at a person or teacher to express anger or just to annoy them and they won't know what it means. If anyone comes up to you and says "Say it" it indicates that you are meant to say "Ya daddio."
Teacher - "You guys have a rough draft due tomorrow for the essay, better get started!"
Student - "Wow, ya daddio!"

Noah - "How was the test? Did you think it was hard."
Henry "Dude it was hecka daddio, thats all I have to say."

Billy - "Fuck you Casey, go home and die!"
Casey -"Ya daddio."

Brett - "Say it!"
Henry - "Ya daddio."
by Yadaddio December 10, 2013
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