UDI is an abbreviation that stands for 'Unidentified Drinking Injury.' It is used in texting and online communication to refer to any injury, such as a bruise or scratch, that is caused by drinking alcohol but is not remembered or recognized as having occurred.
UDI is not a widely used acronym, but it is familiar to those who frequently engage in drinking and socializing activities. It is more commonly used among young adults and college students.