An acronym is a label formed from the beginnings of words (Greek: acro [head] and nym [word]) -- or very rarely, from letters in the middle of words. There is no requirement that an acronym be pronounceable as a normal word (this is a curious myth perpetuated by American dictionaries):  Often they are used as Short cuts for longer words and short sentences. LMAO = laughing my a** off LOL = laughing out loud ROTFLMAO = rolling on the floor laughing my a** off PMP = peeing my pants LMBO = laughing my bum (or butt) off PMSL = peeing myself laughing ROFLMAO = rolling on the floor laughing my a** off BRB = be right back BBS = be back soon BRT = be right there BRH = be right here TTYL = talk to you later TTFN = ta ta for now ASAP = as soon as possible IMO = in my opinion HTH = hope this helps ASL = age sex location AFK = away from keyboard Y = why U = you UR = your NP = no problem NA = no answer or not applicable NM = never mind FYI = for your information PSP = paint shop pro TY = thank you WB = welcome back YW = your welcome SAHM = stay at home mom WAHM = work at home mom WOHM = work out of home mom DD = darling daughter DH = darling husband DS = darling son SIL = son in law DIL = daughter in law FIL = father in law MIL = mother in law SO = significant other