What is Chuck Roast?
1.
A descriptive term describing the after the fact insult of someones rather sizable posterior. ( ass for the less wordy ).
Works especially well if the individual's name is Charles.
"OH my gosh, look at that girls ass."
"What does she feed it, Miracle Grow?????"
ahahahahahah
Then someone says, "Wow, what a chuck roast"
See 
Random Words:
1. 
A slang term for a woman's breasts.
Come lick my luscious fleshmelons.
See britney spears.. 
1. 
1. To laugh out loud like a retard.
 1a. To laugh out loud like a retard in an effort to make fun of someone.
2. To express an extreme..