Lyric discussion by ramthar 

it's pronounced "jamaica".

Robert Plant, in an interview, said it was pronounced "D ya make er", as in "did you make her", meaning, "did you make love to her". It was a popular expression back in that time. It was not meant to sound like "Jamaica".

Benecjt.

If you had copied more of that interview you would have seen that it's actually both. It is correctly pronounced "Jamaica", which with the right british accent sounds like "D ya make er". Which is the whole reason the joke is funny, becase it's both.

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