めっ
me'

Interjection

1. no!; don't!; tsk!

ただし、学生 がくせい本分 ほんぶん学業 がくぎょうですから、期末 きまつテストをおろそかにしたらメッ!ですよ?
tadashi gakusēno hombunwa gakugyōdesukara kimatsutesutō orosokani shitara med! desuyo
However, the duty of a student is to study. So if you neglect the end of term test, that's a "no!".
Other forms: