Urban Dictionary's 2nd and 3rd definition of that are hilarious.
First, the politically incorrect one;
How Japanese people pronounce Eric Clapton's name. Has been featured on several Japanese versions of his albums.
"My favorite Eric Crapton songs are Rayra and Ray Down Sarry."
And then the one that fits in here at The 'Bar;
A more child friendly version of "#$%*Load". "CrapTon" beat out other hopefulls such as "PoopyPound", "DookieOunce", and "BlackBananaGram". Use Crapton when you want to express an extreme amount of something without making a child's ears bleed.
PoopyPound!