Megadeuce 

1. A class of giant fighting robots in the Anime series Big O. Several robots can be seen throughout the series, the most popular ones being Big O, and it's archenemy, Big Duo.

2. A massive, steaming pile of shit.

1:
Oh my God! It's Megadeuce! He's coming to save the day!

2:
Man, I wouldn't go in there, I just dropped a MEGADEUCE, and it's peeling the paint off the walls as we speak.

Megadeuce by Krunk! December 9, 2003

megaduece 

1. taking a really big shit
2. giant mechanized fighting robot on an anime series called "Big O"

1. dude i just dropped a megaduece in your toilet
2. roger is the pilot of the black megaduece

megaduece by nick778 September 1, 2006

Megaduce 

1: A verbal exclamation while straight chucking the duce (to show the peace sign) as to dismiss someone or to pay respect to ones peers while he or she is exiting their presence or ending a conversation

2: A fictitious giant robot from an anime titled "The Big O".

1: Yo man I've got to go squeeze Hershey (to poo) and you'll probably be gone when I get back so megaduce.

2: She kept on cheating so I had to give that bitch the megaduce.

3: P1: "Big O! Action!"
P2: "Where in the world did that Megaduce come from and how can he control it!?"

Megaduce by Kevin Knowles February 23, 2008