A massive, court mandated, religious organization. Used by the United States legal system to 'help' alcoholics, but really sentencing them to 12 steps of self-loathing and christian brain-washing.
To go dutch (i.e. to share equally some expense or cost between two or more person). An uniquely Hong Kong slang prevalent in the 1960s and 1970s, and sometimes still heard today. Comes from the medical term to mean "in equal parts."
Let's go a/a on the 10-dollar meal. That's five from each of us.