Mou ikkai is the romaji for もう いっかい meaning 'one more time'. Popularized by Wowaka in his song 'Rolling Girl' and has come to be a staple in his music. In Rolling Girl it is written like this: もう一回. Though Wowaka has sadly passed on, his music has inspired many other vocaloid artists to start in the first place. Mou ikkai is now in many songs and even included in one of my personal favourites, Amanojaku.

A term used to reference cannabis/marijuana/weed.

Japanese (Romanji) for 'One more time'.

For people who don't understand the meaning of 1 more time, google for the touhou_ikkai.swf.