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A deep-brown or orange tan. Named after the Marshall Islands, where the first H-bombs were tested.

The implication being that the tanned person, looks as though (s)he has been in the presence of a thermonuclear detonation.
I see Clive has been out in the sun. He's got a right Marshall Islands tan on him!
by Roger Mellie 84 June 2, 2009
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