(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
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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
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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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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
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RMS is a 'tag' that appears on the cocks (or in the general area) of some contestants on the popular web site RateMySchlong.com. Raters of cocks can enlarge images to view dicks and then rate the cocks and leave comments.
Dude, I just noticed the RMS on that hot cock when I did the left click. I need to suck that off of there for you. You do not want to get ink poisoning. Let me help save you!!!!
by rickster_dc March 18, 2005
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stands for "Random Makeout Session" - where you and a guy/girl you are NOT dating just randomly make out with no strings attached - works best in cars parked in deserted culdesacs
Jane, you hooker! Stop having RMS with any guy you see!
by jV February 5, 2004
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