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STAD represents the "four bad things" teenagers are told not to do. Each letter stands for one of these things; Sex, Tobacco, Alcohol, and Drugs

An individual gains a point for each category he or she participates in, a 0 being the most pure, a 4 being the most corrupted.
Girl 1: What do you think of that girl in math class?
Girl 2: All I know is that after last night, she has a STAD Number of 4.
Girl 1: No way!
by AKAmazing November 30, 2011
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