Roger

Roger has been slang for penis since the 1600s, deriving from Old Norse/Germanic words where roger means ‘spear’. As a verb meaning to copulate with a woman, it dates from the early 18th century. Roger as in 'roger that' derives from early radio codes in the 1930s where R for Roger means ‘received’. Wilco dates from about the same time and means, will comply. Note that ‘Roger wilco’ is incorrect and superfluous because 'wilco' assumes 'roger' i.e. that the message has been received. See also Copy/copy that