OMG! The exclamatory online abbreviation has won the approval of the Oxford English Dictionary. The term - short for "Oh my God" - is one of dozens of new entries in the authoritative reference book's latest online update. Other Internet-inspired expressions given the stamp of approval include LOL, "laughing out loud"; IMHO, "in my humble opinion"; and BFF, "best friends forever."The dictionary says that although the terms are associated with modern electronic communications, some are surprisingly old. The first confirmed use of "OMG" was in 1917.