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.
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.