OMGLAHT Share definition Flag Acronym... stands for Oh My God, Look At His Toupée. (From the movie "Street Boss".) When I saw the old guy walk past me, I said "OMGLAHT!" OMGLAHT by The Bison Insider March 14, 2011 0 0 Get merch Get the OMGLAHT mug. Buy Now — $32.95 See more merch