Lunji

Lunji is the act of sex between the characters Lunar and Luiji from the Super Cat Tales series.
We have seen it happen twice in the second game in the franchise, Super Cat Tales 2. First time in the Sky Labyrinth and second time in the Cuddle Hotel. It is implied that it happened for the third time off screen.
It can also be used to refer to the romantic relationship of Lunar and Luiji.

person 1: what is your opinion on Lunji?
person 2: it's bad. Putting sex in a game? Gross.
person 1: I meant the romantic ship
person 2: oh