Acronym for 'Rugged Manly Stubble'. Coined in relation to Viggo Mortensen's portrayal of Aragorn in 'The Lord of the Rings' film trilogy. Denotes the rough, unshaven look typical of 'bad boy' characters in movies and men who simply haven't shaved for a week, as opposed to the carefully cultivated stubble common among movie and sports stars. Similar to, but slightly longer than, sexy stubble.
I looked in the mirror this morning and thought, I've got some great RMS going today!

Man, I wish I could grow RMS like Viggo Mortensen. It looks so rugged. And manly.
by Bigby O'Mally June 23, 2011
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Resident Mr./Ms. Sexy
See that guy there? He's the RMS.
by mrfunky August 18, 2005
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The name of one member in the lejindairy group BTS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! His real name is Namjoon and his old stage name used to be Rap monster but now it is RM. He's the leader in the group.
"Wow RM's rap in Mic drop is soo lit"

"Who's your bias in BTS mine's is RM"
by Ghgiuvkuvkuvk November 26, 2017
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The new name for Rap Monster of BTS.
fan: hey Rap Monster
RM: its RM now
Fan: isn't that still short form for rap Monster though...?
RM: I don't know where you got this information, but its entirely inaccurate.
by Tae's little bae January 15, 2018
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1.) You got no jams!!!!
2.) J-hoooooooooooooopppppppeeeeeee!!!!!!
RM: you got no jams my jamless child
JM: :'(
by YOUGOTNOJAMSJIMIN January 2, 2018
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RM is a guy who hoes around a lot but will meet a person who he wants to stay forever with even though his anger issues are a problem at times which hurts the people he love and regrets later. But his love for that one person is so much that no one can love that person better than rm.
girl 1: oh! look its rm he is such a player and a bitch.
girl 2: no he is not people misunderstand him he is such a nice guy.
by someoneyouknowlove00 November 23, 2021
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A returned LDS missionary. Highly prized by LDS girls who have a sweet spirit and burning testimony.
I hear she's dating an RM. I hope my temple reccomend is up to date.
by XRM August 21, 2004
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