mic drop
US /ˈmaɪk drɑːp/
UK /ˈmaɪk drɑːp/

1.
an intentional dropping of one's microphone at the end of a performance or speech to signal triumph or finality
:
•
After his powerful closing statement, the speaker performed a perfect mic drop.
•
Her final answer to the debate was a total mic drop moment.
1.
to intentionally drop one's microphone at the end of a performance or speech to signal triumph or finality
:
•
He decided to mic drop after delivering his powerful speech.
•
She really knew how to mic drop at the end of her performance.