Drunk dialing is a pop-culture term denoting an instance in which an intoxicated individual places phone calls that he or she would not likely place if sober. The term often refers to a lonely individual calling former or current love interests.
Drunk texting is a related phenomenon, and potentially yet more embarrassing for the sender as, once the message is sent, it cannot be retrieved; the message will most likely be misspelled (due to being drunk), and it might be reviewed and shared among many.
Não o acto em si mas o facto de ser prática tão comum que justifique a criação de um nome.
*o texto é da Wikipedia mas foi encontrado aqui.