Epic battle between foes to out-do each other with irritating and annoying youtube clips. Usually played via PM / IM in a tit-for-tat fashion accompanied by gratuitous smacktalk.
Excerpt of a youtube battle;
dood 1: "i counter ur Rick Astley with Abba!"
dood 2: "AIIIIIEEEE!!1"
dood 1: "I WIN TEH JEWTOOB BATTLE!11! lolpwnz0rd"