Vocabulary
めっ
めっ
no!; don't!; tsk!
interjection
Example sentences
ただし、学生(がくせい)の本分(ほんぶん)は学業(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?
However, the duty of a student is to study. So if you neglect the end of term test, that's a "no!".