Gargantous is a word used to describe something that is massive or very very big. Males like to use this word alot.
Billy: hey willy wanna go play swords with our gargantous dicks later
willy: sorry billy i cant i already promised this gargantous dick to my friend andrew later
Usually used in reference to a person who is extremely angry and of below average height and weight. A Garganese will also tend to be a drunk and a chain smoker and a lover of fast food. If you meet one, you should be prepared for an angry conversation that you will probably walk away from feeling very, very offended.
Johnny: Did you see that drunken little fucker in the bar talkin all that shit to me about Obama.
The name given to a woman at Wendy's who was literally wider than she was tall, that demanded that she recieve "10 pieces of bacon on her Baconator Burger and not those little half strips and that they had better not charge her for 20 pieces of bacon."
Guy 1: Did you just see that 5' tall 7' wide woman that wanted all that bacon?
A person of large structure that not only participates in twat like behavior but is basically a twat all the time. They tend to have sister wife hair and have shoes a small child could sleep in.
Oh look there's that gargantutwat. I expect she is off to tell someone how to do something she has never done before.