What does Bathtub Chemist mean?

Bathtub Chemist meaning in Urban Dictionary

Someone who manufactures illicit drugs inside their back area, usually on a table or perhaps in a bathtub. The conditions these medications are created and kept in are extremely dirty and medications made usually are cut with various other substances (everything from less expensive medications to talcum dust to bleach to rat poison), either since they have limited familiarity with drug make and biochemistry or (more likely) because they could not care less in regards to the health and well-being of their prospects. They instead choose to make use of less (or nothing after all) of advertised medicine every pill/dose therefore boost profit.