This statement is used quite often on AB. I really hate seeing it and in my opinion it is a childish, petulant and frustrated response when the poster is feeling defeated in their argument. Thankfully it isn't as annoying as 'Do one'.
I think what irritates me most is the lack of imagination. I would like to see some more creative terms, e.g. Ya boo sucks.
What other phrases, new or old, can we come up with that basically say 'I've lost the argument but I'm not backing down, 'cause I'm right?'