Usually pronounced as "Guidooooneee", emphasis on the "o". Guidone is an Italian name, a nickname for it is Guido, even though the name Guidone is a good enough name and doesnt need a nickname. A person from the Guidone descent is the cool kid at school, hott, everyone wants to be their friend cuz they are where the party's at. The essence of cool.
A guidonaut is the rarest form of guido. Much like regular guido's, guidonaut's use so much hair product that it disrupts their normal brain function. These guido's think they are the greatest thing in the universe, because if you let them talk long enough they will likely tell you they have been to space. Guidonaut's are generally rude to male's and downright degrading to women, especially of foreign descent.
Woman: Guess what I got on my test?
Guidonaut: I don't care! Look at my hair.
Woman: 95%
GN: What you beat me, how is that possible, your a woman.
Woman: Excuse me.
GN: Yah well, it doesn't matter, I have been to outerspace in my VeeDub rocketship!!!
Proper noun. A guttural dialect spoken largely in Italian-American neighborhoods or at the Jersey Shore by Italian-Americans, largely a combination of stock phrases like fuhgeddaboudit and malpronounced Italian words (i.e. gabbagool for "capocollo") that are passed off as being true Italian. A subset of English that makes real Italians cringe.
(A sample sentence of Guidonics below)
Vinnie: "Ey yo, youse wanna come over for dinner? My mom's making macaronis wit gravy."
An adjective to describe the behavior of a greaseball who may display the following:
wears too much cologne; drips hair gel, wears New York Giants/Jets/Yankees clothing; abuses steroids, rocks a large chain; ends every sentence with "bro;" asks for Jagerbombs incessantly; preys on drunk women.
"Did you see that guy with the Yankees jersey try to hook up with that wasted girl? That's guidonculous."
"That guy in the Members Only jacket is wearing a guidonculous amount of Brut cologne."