Okay, so, this is probably picky, but ... BCD, CWOT, TWITA, EBCAK, and LQTM are not really "Internet slang" - heck, they don't even stand for "slang", with the vaguely possible exception of EBCAK - error between chair and keyboard. They're simply initialisms. (In fact, I'm not sure the guy who figured out that QTM was this sort of "laughing" (quietly to myself) had ever seen it before.)
Slang is something like pwnd or rick-roll or copypasta or even teal deer - actual words. Not just the initials of easily comprehensible phrases.
(The others are Behind Closed Doors, Complete Waste of Time, and That's What I'm Talking About)