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Condensed form of the name 'Martin Luther King Jr' (minus "Jr." of course), an early-mid 1900's clergyman and African American Civil Rights activist. January 15 is a national holiday in the United States to commemorate King.

Most often used with 'day', MLKing is widely pronounced two ways.
"Milking" Day, or "Mulking" Day
Student 1: We've got a long weekend! Yeah!

Student 2: Why?

Student 1: Because Monday is MLKing Day!

Student 2: I love MLKing Day! No school!
by MLKingDay January 16, 2010
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