1. Recommended Daily Allowance. Refers to some nutritional standard used by the FDA.
2. Raw Dog in the Ass. Refers to anal intercourse without the use of a condom.
1. Most vitamin tablets contain 100% of the RDA of vitamin C.
2. The girl I'm sleeping with contains 100% of my RDA (not right now... I'm typing).
Bonus Usage: Why do they put RDA on cereal boxes!? That's sick!
(Yes, one time I forgot what RDA actually stands for. Sorry, mom)
Retard Units. Used to describe English Measurement units (as opposed to SI Units). The F expresses frustration... although not in those exact words.
WTF is a psig!? These FRUs are killing me.