Doing activities considered immoral by certain people. Drug use, sexual promiscuity, prostitution, gambling, recklessness, cheating, lying, and selfishness are commonly considered vices. People that are vicin feel cool and very good about what they are doing. Derived from "vice".
- Yo, J, did you see that guy last night playing poker while drunk and high?
- Yeah, man, he was vicin fo' real...