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1.
RFS
Reality Filtration System (RFS) ~ The mental capacitor in a person's mind which is used not only to decipher reality from fiction... but to decide how, or whether to, share their skewed opinions on a subject matter with others online.

A person's RFS can be used to distinguish the validity of a message commonly received through visual and auditory channels (televison, radio, third party interraction, etc.).

The RFS is also charged with determining what the person does with information they receive. If they choose to share the information as well as accompany it with an opinion, their audience will be placed in a position to determine if the messenger's RFS is working properly.

RFS, when used in the descriptive sense, is most often used when referring to a person who posts inaccurate information while passing it off as fact... then proceeds to vent, ramble, pontificate or lecture about their views on the subject matter without any realization of how they are perceived by the recipients of their postings.

Their opinionated message is most often followed by incessant postings over an extended period of time. So much so, that the recipients either ignore or simply block/unfriend the person in order to relieve themselves of the constant barrage of redonkulousness.
Cam: Can you believe what Fred posted online?! It's bad enough he believes all that poitical crap, but does he have to constantly blast our newsfeeds with it? I'm probably gonna block his shiz.

Butch: Yeah, he posts that stuff ALL THE TIME!!! Fred's RFS is so out of wack that he doesn't realize most of the folks on his friends list think he's absolutely nutz! That, or he simply likes being an inconsiderate crazyass.
by SickaDatShiz January 25, 2013
 
2.
RFS
RFS, an abbreviation for Really Funny Stuff, is a popular phrase that is being used in Internet slang. It is a replacement for the long out dated, and over used "LOL". It is one of many initialisms for expressing bodily reactions, in particular laughter, as text, including initialisms for more emphatic expressions of laughter such as RFFS ("Really Flippin' Funny Stuff")

The list of acronyms "grows by the month" and they are collected along with emoticons and smileys into folk dictionaries that are circulated informally amongst users of Usenet, IRC, and other forms of (textual) computer-mediated communication. These initialisms are controversial, and several authors recommend against their use, either in general or in specific contexts such as business communications.
On May 15, 2011, RFS was formally recognized in an update of the Urban Dictionary.
Guy 1: Hey man, check this funny joke, Two fish swim into a concrete wall. One turns to the other and says "Dam!"
Guy 2: Whoa that's funny, RFS.
by TheMatWilliams May 15, 2011
 
3.
RFS
Stands for Restless Face Syndrome. Some people, while observing their behavior, cannot maintain a consistent facial expression. As a result their face moves rapidly and even occasionally twitches. This syndrome is also linked to the rare Hannahcyrus virus!
While videotaping Emily and talking about salted babies, her face went from happy, to confused, to out of control RFS.
by Cabby Abby July 31, 2010
 
4.
RFS
Ready For Sex - similar to DTF(down to fuck) meaning willing to Fuck.

Sometimes R4S
Bro 1: Yeah I met this chick at the beach

Bro 2: Sweet is she RFS though?

Bro 1: Yeah!!
High 5
by Hanzbro February 13, 2012
 
5.
RFS
(Restless Facebook Syndrom)- The obsession of checking Facebook every 30 minutes to see if you have a new notification, friend request, or Farmville update.
Dude: Man, John has the worst freaking case of RFS.
Dude 2: Why do you say that?
Dude: He doesn't even leave the house in case he gets a new notification.
by pudapasky March 24, 2011
 
6.
RFS
An acronym for "Ready Fucking Set"
"Are you RFS?", asked Tyson.
"You bet your ass I'm RFS", responed Mike.
by Kyle November 26, 2003