"Kokorobosoi na" (EN: Forlon, aren't you?) is the second ending theme of the 1981 Urusei Yatsura Animated Series. It was performed by Helen Sassano, who sung "Margarita", another song that appeared in the series.
The song was used in the meme "Bom Dia!" sometime during September of 2020. This led to it somewhat growing in popularity, mainly within some Latin-American internet communities, where the meme appeared and spread.
