cyberslang Share definition Flag The term used to refer to words and/or expressions commonly reserved for use online in chatrooms or instant messengers. |_33+, Blog, LOL, LMAO, ROFL, ROTFL, ROTFLMAO, BRB, BBS, TTFN, TTYL, IRL. cyberslang by ldne May 15, 2005 0 0 Get merch Get the cyberslang mug. Buy Now — $32.95 See more merch