de buenas a primeras

Adverb

 * 1)  out of the blue
 * 2)  at the drop of a hat, at a moment's notice, in a heartbeat, all of a sudden
 * 1)  at the drop of a hat, at a moment's notice, in a heartbeat, all of a sudden
 * 1)  at the drop of a hat, at a moment's notice, in a heartbeat, all of a sudden