mic drop

or mike drop

[mahyk drop]Informal.

noun

the act of intentionally dropping one’s microphone at the end of a speech or performance, displaying a bold confidence that it has been very impressive or cannot be topped.
something, especially a statement or action, that displays such a bold confidence: Her insulting response was the ultimate metaphorical mic drop.

interjection

(used to indicate that something has been very impressive or cannot be topped): She definitely wins for best Halloween costume! Mic drop!

Origin of mic drop

First recorded in 2010–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019