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1.
RSO
short term for:
registered sex offender
Dude if you were to do that you'd be RSO
by JuanBalldez August 21, 2007
16 1
 
2.
RSO
Range Safety Officer

Someone certified by the NRA as a Range Safety possess the knowledge, skills, and attitude essential to organizing, conducting, and supervising safe shooting activities and range operations.
Guy 1: Yo bro who is that guy that just yelled at us?
Guy 2 : That was the RSO, hes a pain.
by kuku02 December 27, 2011
7 3
 
3.
RSO
Random Song Outburst
They have lots of RSO's in West Side Story.
"Lalalallalalaaaa" = RSO
by ¬_¬ Moo! June 10, 2009
3 4