An interjection of disgust about something that will never work from recently on, no matter how hard or easy you try. Usually it's an item or idea that has worked well in the past, but is totally knackered in this modern age. Comes from C programs written for an older version of the toolchain which flatly refuses to compile on the newer toolchain.
Going to war with spears?? Undefined reference to _sbrk!

I tried to use sorcery to turn my Yugo into a Rolls Royce, but got an undefined reference to _sbrk.

CoolGBARom.c error: undefined reference to _sbrk
Get the undefined reference to _sbrk mug.