Abbreviation for "Back in the Day,."
I used to be great at those old-school video gsmes BNTD.
Any drink, usually alcoholic, created with items on hand during a quarantine. The key is that leaving the house to get ingredients is not necessary.
Let's see...creme de cacao, a splash of vanilla vodka, top with hard seltzer... pour it all over ice, and...boom! An egg cream Quarantini.