RSN

(In SMS-language:) really soon now
Found on http://www.mantex.co.uk/samples/texting.htm

RSN

real soon now
Found on http://www.archivemag.co.uk/

RSN

Real Soon Now
Found on http://www.netlingo.com/acronyms.php

rsn

real soon now
Found on http://www.noslang.com/dictionary/r/
No exact match found