There are several levels of Sir Charles.
Level 1: A Normal Sir Charles - Just a great big ass
Level 2: A '93 NBA Finals Sir Charles - An incredibly shapely, gigantic ass
Level 3: A '92 Dream Team Sir Charles - The greatest ass of all-time
Derived from Charles Barkley's nickname "The Round Mound of Rebound," except in this case it's the "Round Mound You Wanna Take to Pound Town"
"He told me that he ran the stop sign because he was in a hurry to pick up the girl I saw get in the passenger seat."
The officer continues: "He asked me to admit that she was 'hot.' He asked me, 'You want the truth?' When I told him I did he said, 'I was gonna drive around the corner and get a blow job. He then explained that she had given him a 'blow job' one week earlier and said it was the best one he had ever had in his life."
Boyfriend: "Baby, I want a sir Charles tonight!"
Girlfriend: "What the hell is a sir Charles?"
Boyfriend: "A BJ. Not just any BJ...but, the best one I have ever had in my life!"