Abbreviation for Date Of Birth. Commonly used to calculate legal time of issue for driver's license, access to voting facilities/cigarettes and alcohol purchase by DMV personnel, polling center operators/convenience store owners and liquor store cashiers, respectively.

Known habitats include:

Attempting to falsify your DOB for the purposes of premature access to a car, a voting booth/tobacco products, or alcoholic beverages may land you in trouble or even jail.

Attempting to falsify your DOB for the purposes of hiding or reducing your actual age will be met with subtle pity or contempt by anyone in the know.

Australian & British Slang: used in the phrase "dob in {someone}", or "dob on {someone}", meaning "to inform on", usually to an authority figure.

Ex. "Fred stole a car, and now I'm going to dob him in"

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