Top Definition
Stands for "Retarded Mouth Syndrome". When girls get together to take pictures, instead of smiling, they often resort to retarded ways of forming their mouths. Examples include weird "kissy" faces, random forms of lip distortion, and overall retarded looks on their faces. Unfortunately almost 100% of girls will catch this disease over the course of their lives, just check your facebook friends.
"Dude Stacy is pretty cute."

"Yeah but check out her Myspace, she's got RMS"
"Ah damn, she really did ruin all of these pics."
by Morfene April 19, 2010
(root mean square) Preferred method of rating continuous power handling of a speaker (input) or amplifier (output)usually measured in wattage.
My amp's 1500 watt power was too much for my speakers 2000 watt peak power, becuase the rms was only 500.
by Mike Millie August 29, 2008
Abbreviation for "RUB MY SHAFT". Used in replacement of SMD (Suck My Dick).
Guy: hi, do you work at subway?

Girl: no...

Guy: cause you just gave me a footlong

Girl: ew, creep

Guy: RMS!
by stevenbains69 March 21, 2011
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
meaning Real Massive Shit. To the point your so constipated you can no longer withstand to hold it. Aslo can be identified if you clog the toilet to the point it overflows.
Student: "Excuse me, teacher."
Teacher: "Yes."
Student: "I got to take a huge RMS. May I be excused?"
Teacher: "Of course you can." Just don't strain yourself."
by dj_holydumbf**ck October 18, 2006
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