Definition of "bday" [bday]

• Birthday (noun)

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• "OMFG!! boo you rock!!! my bday is on fri and this would be an awesome gift"
• "I was looking on the Clarion site and, unfortunately, my 18th bday is after the start date."
• "I was wearing a celtic cross necklace that my grandfather got when he was stationed overseas, and was given to me, since my bday is March 17."