A rather unfortunately common misspelling of the phrase, "
open mic" which is an event staged by bars & nightclubs allow ordinary people to go onstage and sing, tell dirty jokes, or spout off a bountifully overflowing cornucopia of
toilet tongue just to try and liven up an otherwise dull house.
Seen in printed material only (such as a sign in a window); as "
open mike" and, "open mic" are pronounced exactly the same.
