MMHRD definition by Slang.net
This page explains what the acronym "MMHRD" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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MMHRD stands for "many many happy returns of the day," which is a phrase people use to wish others good fortune. This phrase is typically used on a person's birthday, and it is used by British, Indian, and Irish English speakers more than Americans.
Many many happy returns of the day is a salutation that has been used since the 18th century. While the phrase is still sometimes used to wish others well during the holidays, it is most often used to wish a person continuing good health on their birthday. The "returns," in this case, are the many additional birthdays the sender hopes you'll be celebrating.