Home : Chat Slang : LMAO LMA | LMAOROF Tweet LMAO Meaning Laughing my a** off Type Acronym Rank ★ ★ ★  Common Usage Online Only (chat, messaging, e-mail) Comments A common phrase used when something is especially funny. Also part of several more elaborate acronyms. Updated December 19, 2012 All "L" Chat Slang Chat Slang Home Print