Contrary to popular belief, Roger does not mean "I will comply". That distinction goes to the acronym wilco, a contraction of the phrase "will comply".
Roger is also a short version of the term Jolly Roger which refers to a black flag with white skull and crossbones, formerly used by sea pirates since as early as 1723.From c.1650 to c.1870 Roger was slang for the word "penis" probably due to the origin of the name involving fame with a spear.
Therefore "to roger" became slang to copulate with a woman.
Hence I am "THE DIRTY ROGER"
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Pics from the Louisiana show on the 31/08/2008- thanks to Matt for the photos