Source : Free On-Line Dictionary of Computing

nadger
     
        /nad'jr/ [Great Britain] Of software or hardware (not people),
        to twiddle some object in a hidden manner, generally so that
        it conforms better to some format.  For instance, string
        printing routines on 8-bit processors often take the string
        text from the instruction stream, thus a print call looks like
     
        	jsr print:"Hello world"
     
        The print routine has to "nadger" the saved {instruction
        pointer} so that the processor doesn't try to execute the text
        as instructions when the subroutine returns.
     
        [{Jargon File}]