The smiley-face which supposedly means "no offence" but implies everything but.
It's not really a phrase or buzzword, I guess. But that's what makes it so insidious. Tacking on a :) after an interweb missive clearly intended to put me in my place "politely" is guaranteed, instantly, to make me twice as miserable/enraged. But I think you know that. That's why you do it. You smug twunt :)
(lonelybadger, Fri 9 Apr 2010, 20:56, 4 replies)

:)
(Juan Quar is clinging to her front teeth on, Fri 9 Apr 2010, 20:59, closed)

;)
( enoughblueskyforsailorstrousers, Fri 9 Apr 2010, 21:18, closed)

Agreed
Another one which I find in a similar vein to this is the false smile one with a sharp intake of breath. It essentially means no fucking chance but the person is just finding the right words to say it.
(muzzvsworld, Fri 9 Apr 2010, 21:03, closed)

See also
"I'm not upset at all :)"
( Major Turd for tonight only, Fri 9 Apr 2010, 22:39, closed)