also: げっく
noun
Monday 9 PM TV drama slot
Abbreviation of 月曜９時. Refers specifically to the Fuji TV Monday 9 PM time slot, famous for romantic dramas. Used as a noun to talk about the slot or the dramas aired in it.
今期の月９は恋愛ドラマだ。
This season's Monday 9 PM drama is a romance.
月９枠で放送されたドラマは高視聴率を記録した。
The drama aired in the Monday 9 PM slot recorded high ratings.
Full form; 月９ is the common abbreviation used in media and casual conversation.
Abbreviation of 月曜 (Monday) and ９時 (9 o'clock), referring to the Monday 9 PM television time slot.