'Dutch' = 'Deutsch', hence Ja Ja Ja. Not sung much these days as it contains the 'n' word, as Guest above hints. The verse about going to the brothel was my favourite;
'We do all the bawdy hooses[x2]
und ve hitchen up der trooses
und ve catchen all der louses'
mit mein ja, ja, ja.

Bowdlerising or not is a can of worms, isn't it ? Anyone else noticed the sanitized version of 'Rollin'the Woodpile down' performed by Bellowhead on the BBC awards show recently ?