hard code

Short definition from Wiktionary

Verb

1. 1
   To build absolute and unchangeable values into a program such that they can only be changed by modifying the source code.
2. 2
   To insert an unchangeable program into a device; to hard-wire.
3. 3
   To insert subtitles inside a video file, permanently modifying it.
4. 4
   Alternative spelling of hard code.