Japanese (Romanji) for 'One more time'.
For people who don't understand the meaning of 1 more time, google for the touhou_ikkai.swf.
Pete: "I've been watching the 'Mou ikkai' vid over and over again and I just can't stop it. "
John: I did stop it once but put it right back on...
Pete; Ye, it makes you feel empty inside doesn't it?
John: I'm listening to it right now, but I still miss it.