Keeping me waiting is...
待たせるなんで言-
"言" is a part of the kanji "論"
The whole line is:
待たせるなんで論外よ
mataseru nande rongai yo
'Keeping me waiting is out of the question'World's Number One~
Opening lyric to "World is Mine"
sekai de ichiban o-hi-me-sa-maChibi Miku-San 339Try a little harder ok~