Top Definition
when a friend gives a specific time to leave an event because they are the driver and will leave your ass behind if you arent in the seat at that time.

Ass In Seat
"dude im driving and i have work in the morning, so A.I.S Rule applies."
"A.I.S. Rule bitches im leaving in one hour"
by Dr. figilthorp May 29, 2011

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