The social indoctrination to the bar scene
that occurs on or immediately after one's twenty-first birthday. Typically, the guest of honor
on a "21 run" is forced to consume copious amounts of alcohol in a short
amount of time. This often
results in illness, and, in extreme cases, loss of consciousness. The prototypical "21 run" occurs from 12:01 AM until 2:00 AM on the participant's birthday, this
time being the first at which
said individual is legally
eligible to consume alcohol.
A man's friends who are already twenty-one pick
him up and take him to the bars one minute after he turns 21, at 12:01
AM on a "21 run"