[UK, from rude slang noun nadgers for testicles; compare American &
British bollixed] 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. See adger.