Guidonia 

Homeland of the Guidos, an ancient race of smelly, tan dumbfucks.

"One cannot simply walk into Guidonia."

Guidonia by The Duke of Hemophilia January 21, 2010

Guidonaut 

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!!!

Guidonaut by B. Aldworth, Phd, R. Heinbuch March 31, 2009

Guidonics

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."

Guidonics by The Gob o' Ghouls January 11, 2013

guidenial

When someone will not accept the fact that they are a guido or guidette.

Just because I go tanning, wear hair gel, and fist pump doesn't mean I'm a guido!

Dude.. you're in such guidenial.

guidenial by jackalackie January 7, 2010