In Spartan Ops Episode 7, you can see an example of this phrase in work, when Dr. Halsey uses it on A.I Rolland to break from her cell.
Roland: Such as?
Halsey: Such as the phrase "Undid Iridium".
*Roland begins glitching as he attempts to repeat Undid*
Roland: UNSC AI override instructions active, Doctor Catherine Halsey (in calm, new voice).