webbreviation 

n. Short for "web abbreviation." These internet acronyms either contribute to our rich online culture or expedite the demise of intellectual civilization (depending on who you ask). Some popular webbreviations include lol, brb, ttyl, btw & idk.

Steve: How would I look in a cape?
Randy: idk
Steve: Whatever. I'll never be able to pull it off as well as Dina anyway.
Randy: lol
Steve: Randy, stop that!
Randy: Stop what?
Steve: You've gotta be the only loser who uses webbreviations when chatting in person.

webbreviation by The Raging Bull August 27, 2005

webreviation 

Abbreviations that are commonly used in online chat or text messaging. Some examples are wtg(way to go), brb (be right back), rofl (rolling on the floor laughing), and fwiw (for what it's worth).

I can hardly understand your text message because you've used so many webreviations.

webreviation by E!! November 2, 2007