Charlie Brown = Bad Cocaine. This could be either because it gives a bad experience, is contaminated, or just not very good. Derived from the slang from cocaine - charlie, and the peanuts character Charlie Brown.Often abbreviated to CB.
"don't get the coke from him though, he charlie browned us last time" (dont use him as a dealer, he gave us awful cocaine last time)
"it was like totally charlie brown" (it was really bad cocaine)
"I'm blatantly gonna pass him CB, he's totally oblivious" (I'm gonna sell him bad cocaine because he has no idea what to expect)