A beer that you drink as soon as you arrive home to prevent you from leaving again, i.e. driving back to work or to pick up a friend at the airport. A safety beer guarantees you a free pass as no one would ask you to drink and drive.
Boss I would love to come back in but I have had a safety beer.
Babe you know if I hadn't already had a safety beer I would pick your mother up at the airport.
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