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4. RFD
Abbreviation for Really Fucking Dumb. Best used like a trademark symbol to ridicule anything that is really fucking dumb.
A junior high school boy received a blowjob from a friend in his class, which the hystericals have labelled Sexually Harmful Behaviour<sup>RFD</sup>.
1. rfd
Stands for "I'm really fucking disgusted."

Obviously can be used in disgust, anger or rage.

Synonymous to "smh" and "wtf."
Person 1: Dude that kid just called you a douche.
Person 2: Wow what a chode. Rfd.
2. RFD
Short for Reverse Flacidity Disorder, where the penis becomes smaller on erection.
e.g. Person 1 "Your boyfriend's got RFD"

Person 2 "Your mum didn't mind"
3. RFD
R.F.D. (Rapid fire diarrhea)One of the potentially hazardous side effects of consuming SPLENDA® based products such as diet coke and low calorie yogurt.
After consuming SPLENDA® I felt very panicky and shaky and immediately had two bouts of RFD.
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