Post haste

"Post haste" means:


 * 1) As fast as possible; with all possible haste.
 * 2) With the greatest possible speed or promptness
 * 3) (Archaic) In great haste.


 * Sources: http://www.definitions.net/definition/post-haste, http://www.dictionary.com/browse/posthaste, https://www.facebook.com/posthastetravel, http://www.posthaste.co.nz/tracktrace.html, https://www.digitalrebellion.com/posthaste/ and http://www.post-hastebizsolutions.com/.