The Brief: The "You dropped this π" comment on social media refers to the intended recipient as a king or queen after they've done something sweet, heroic, legendary, or iconic online.

DEEP DIVE
The comment “You dropped this” followed by a crown emoji is a response to a legendary, sweet, heroic, or iconic moment on social media. That moment can alsoΒ include clapbacks, expository threads, or other amusing memes. The comment refers to the intended recipient as a king or queen.
This sort of comment is very popular on social media, as of June 2020. It’s unclear when it first began growing in popularity. The earliest Urban Dictionary entry mentioning it is from April 2020.
Twitter user @AmberRoseCavaz1 responded to a video of a TikToker calling out her racist classmates with “I think you dropped this π.”
I think you dropped this π hope! @HSUTX please do something about this, stand up for minorities for once instead of being neutral! https://t.co/hqPs6qNyqL
— Amber-Rose Cavazos (@AmberRoseCavaz1) June 24, 2020