1.Not literally as it is, this expression is used only when two friends (either existing gender), happens to kill another one accidentally and one or neither of them never tried (to solve this problem together) to sing the same song of regret yesterday.
2. To paraphrase, "Sing (or sung) Yesterday's Music sheet", is to settle a problem between two friends (usually a love situation." So when saying sing or sung, it is meant to settle.
*interrogation of deceased person's friend*
Police: It's not entirely your fault
Boy/girl: No! It is! I should've been the one to Sing Yesterday's Music Sheet with him/her!
Used during that awkward timeframe where you've stayed awake past midnight, and thus the "today" in your head is technically yesterday
At 3am
Friend 1: Yesterday today was amazing
Friend 2: Please just say today, I know what you're talking about
A phrase meaning , please stop giving me advice, I know what I am doing.
Mother. Adrian go take a shower, then do your homework, not the other way round.
Adrian. Mother., I wasn't born yesterday, I will take a shower when I feel its appropriate.
A movie trope in which a female character has a child-like innocence, naivety, or intelligence while being an attractive, sexualized woman. This allows male characters to teach, dominate, and take care of the woman while being sexually attracted to her. This innocence means the character may make “sexy mistakes” like changing or bathing in front of the male lead while being unaware of her desirability. The best known example of this is Leeloo from The Fifth Element
I wanted to see Poor Things, but apparently Emma Stone is just a born sexy yesterday.