you: yo is that full of dope?  them: yeah its one big fat dope sack innit  you: yeah its huge
big fat dope sack is a sack ful of marijuana or some people who take drugs call it heroin
"you: yo is that full of dope?  them: yeah its one big fat dope sack innit  you: yeah its huge" What is the definition of "big fat dope sack"?