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

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Top Definition
RSO
short term for:
registered sex offender
Dude if you were to do that you'd be RSO
by JuanBalldez August 21, 2007

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RSO
Acronym for Rick Spencer Oil, a medicinal oil derivative of marijuana, not unlike CBD oil, but formulated differently. RSO is purported to assist in curing cancer, diabetes, and other debilitating diseases by rejuvinating the body's own ability to do so. RSO is not currently approved by the FDA, but is hailed by stoner counter culture as the penicillin of our time (2017).
RSO got me feeling alright; all my cancer indicators are way down.
by Matty, the judge February 13, 2017

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RSO
Random Song Outburst
They have lots of RSO's in West Side Story.
"Lalalallalalaaaa" = RSO
by ¬_¬ Moo! June 10, 2009

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RSO
Regional Security Officer.
Jack Garrett: Mae, I want you to meet with the RSO to get a feel for the situation - on the ground there.
Mae Jarvis: Way ahead of you, boss. I already traded emails with the Regional Security Officer, who gave me the lay of the land and said that there have been - no recent abductions.
by Swapo Völker August 05, 2016

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One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt