"Back-slang proper, sometimes employed by barrow-boys and hawkers, and indigenous to certain trades such as the greengrocer's and the butcher's, where it is spoken to ensure that the customer shall not understand what is being said ('Evig reh emos delo garcs dene'--Give her some old scrag end) consists simply of saying each word backwards, and when this is impossible saying the name of the letter instead of its sound, usually the first or the last letter, thus: 'Uoy nac ees reh screckin ginwosh' (You can see her knickers showing).