Drop The Mic Meaning

(slang, idiomatic) To do or say something decisive, meaningful, or impressive.

Example: 2012, Steph Harmon, "Meta Is Better", Brag, Issue 466, 11 June 2012, page 26:
  In their past work, both Whedon and Goddard have shown an inclination to embrace tropes so tightly that you're forced to question them – and with Cabin, as one journalist in the room suggests, 'There's kind of a sense of this movie dropping the mic [on the genre] and walking away like, 'There it is guys. Ball's in your court.'
2014, Tina Chadha, "Rodarte", Metro (Boston), 11 September 2014, page 11:
  Rodarte just dropped the mic on fashion week. After last season's esoteric tribute to "Star Wars" – really, how many women would wear a gown emblazoned with a giant Luke Skywalker? – sisters Kate and Laura Mulleavy's dazzling spring outing mixed the right amount of fantasy and commercial appeal.
2015, Joe O'Shanksy, "Miracles happen: George Miller drops the mic with 'Max Max: Fury Road'", The Tulsa Voice, Volume 2, Number 11, 20 May 2015 - 2 June 2015, page 40 (used in title only)
For more examples of usage of this term, see Citations:drop the mic.