You sometimes see this on supply manifests in the military. It basically means "We don't need this, and didn't even order it." Stands for "Redundant, Excessive, or Trivial; Unknown Requisition Number" OIL
Conveying Other Notions That Really Aren't Describing Incidents, Causing Total Idiocy Or Negligence Pop-tart
Zebras Eat Nachos In The House IRHBSM (I've now noticed that most of the acronyms everyone's been sending are words lol)